Had a wonderful trip to the Westin resort with my partner and overall I couldn't fault the hotel..... Our room was very comfortable and well maintained by the housekeepers despite the fact it looked like a bomb had hit it after all our shopping.
The food was excellent...especially breakfast in the Taste restaurant...a feast that set you up for the rest of the day. We also had a very pleasant Italian evening in Prego on the 2nd floor I believe.
I love to go to the beach and the hotel was right on a beautiful powder white sandy beach which gently sloped into the turquoise sea...idyllic!
The ONLY complaint I have is that there were only a handful of sun umbrellas on the beach and most of the sun loungers were exposed to the the fierce heat of the sun...please can we have more parasols??
Overall we had a wonderful stay and if you enjoy shopping you will be in heaven....

Due to a reroute - we happened to find ourselves at the Westin Guam. It was an excellent resort. The front desk, especially Edward provided a level of service which was above and beyond! The hotel itself is well located as it has the best piece of beach in Guam (hotel wise). The best option for breakfast was the buffet - more bang for your buck! Free wi-fi was found in the lobby only and the room products (shampoo, conditioner, etc...) are excellent! Across the street and a short walk away is an ABC store, as well as may dining options. We overlooked the ocean - which was a major bonus. The housekeeping staff was excellent too!

My wife and I stayed here for our honeymoon. We stayed on the club floor. Room was very nice and looked out onto the ocean. Fantastic view to wake up to every morning. Club floor host was very nice, although they were very busy during breakfast period and had trouble keeping all the items stocked.
We enjoyed our stay, and would stay here again. However, we noted in our reservation, and in emails to the concierge desk before we arrived that we were there on our honeymoon. It was very disappointing that not one person we came in contact with acknowledged this special occasion for us. I expect more from a hotel chain of this level.

Went to Guam with boyfriend to see a friend who lives there and thought it might be nice to spend a couple of nights at one of the resorts. Went for the Westin at friend's recommendation. Booked the Royal Beach Club room which included use of the executive floor equivalent (Royal Beach Club lounge on L21) cocktail hour and continental breakfast. Sounded good!

Check in at 'VIP' check in - no major issues except when I provided my address (central Tokyo) the two staff on duty (Japanese liaison and Korean liaison officers I think...) said "oooh, rich people!" which frankly I thought was tasteless...

Next, decided to take the friend to the Royal Beach Club lounge for a nice cup of tea, only to be told by the staff member who checked me in that only family and friends who are staying in-house can be brought to the exec floor. I told her that the conditions I had signed said that "Family and friends of in-house guests may use the Royal Beach Club - fees may apply" but she kept asking for my friend's room number. Appreciate that English was not her first language but conditions were fairly clear. Less than 30 minutes in and NOT happy.

Went back to room to find that the wall next to the toilet had a snot mark on it - yes, previous guest had picked nose and wiped it on the wall next to the toilet...and housekeeping hadn't noticed.

At this point, paying over US$250 per night, felt the need to complain. Went to the front desk and explained the two issues above. I showed the lady on the desk the T&Cs and she agreed that I was permitted to take friends/family to the Royal Beach Club lounge. Promised to send housekeeping to clean the wall but they never showed. At this point, lady who checked me in (Japanese liaison) had spotted me and tried to explain to me that the English T&Cs were wrong / out-of-date / whatever (Westin caters primarily to Japanese tourists) and that they needed to be updated. She indicated that not much could be done (had requested to move to a standard room with a full breakfast) because I had booked through a third-party (hotels.com) despite my being a SPG. Think that, but don't say it - is my advice. Pretty unimpressed.

Resigned to the fact that I was stuck, thought I'd make the most of it. Went to cocktail hour in the RBC. Let's just say I needed to lower my expectations even further. 'Cocktail' means about 5-6 spirits and about 3-4 mixers. You make your own drinks. On the bright side, the cheese plate was good...

Next morning, went to the continental breakfast in the RBC lounge. Pastries rubbery and scrambled eggs grey. Decided to go for the cereal and fresh fruit. Can't really mess those up.

Beach cabana after that. Nice enough but not really worth paying extra for.

That evening, a bit peckish and still smarting from the rather average continental breakfast, ordered the all day breakfast from room service. Expensive for what I got and eggs not cooked to order. Sigh.

Next day was better but spent most of it outside the hotel.

In short, would not stay there again. Realise that initial experience led to major confirmation bias but hotel should've tried harder and not made excuses...

Next three days we hired a car and stayed at the Santa Fe Hotel in Tamuning (away from tourist central), snuck into the Hotel Nikko to use the water slides (food MUCH cheaper poolside here), drove around the island and ate at the local restaurants. Was a lot more fun!