I'll start with one caveat- I've stayed at the W South Beach on three seperate ocassions the past three years for five days each time but on my company's dime, not mine. Yes, it's expensive. That said I love everything about this property. I feel spoiled and indulged from the moment I walk in the front door. The rooms are beautiful and the lowest room category is very spacious by most standards. The beds are amazing and the views at least on the higher floors are great. The lobby is trendy and the bar and pool area trendier. I don't think this atmosphere is for everyone and it's not for me on most ocassions either, but this is South Beach- if you're looking for a quiet relaxing weekend this might not be the place. The pool does get crowded so go early for a good sun filled spot. Laying on those comfy beds with a drink in hand is heaven and the people watching is unreal and highly entertaining.
If I was paying for everything on my own I probably (ok, certianly) would not have indulged in room service and poolside service the way I did- I would not call it 'good value' but I enjoyed everything that I ate and drank. I have always found the service throughout the hotel to be incredible and friendly from the doormen and front desk to housekeeping and security- it is a big hotel though and I could see how this might not be consistent for all visitors on all occasions. I look forward to returning again next January and if I ever have reason to be in Miami personally I would not think twice about booking the W South Beach, even on my own dime.