It's worth noting that this place was originally called the Napili Kai Beach Club, and later renamed to "Beach Resort" due to confusion about who it was available to. It really is a low-key, very quiet group of rooms. No building is over two stories tall, so look elsewhere for you skyscraper fans.
There's tons of reviews here already, so I'll limit mine to things I haven't yet seen or disagree with.
We stayed in a Keaka room, with air conditioning, while my girlfriend's parents stayed in another building which did not. I'm not sure about the necessity of it, though - we used it to dry out the air of the room much more than cool it down, as it reached about 70F each night. It wasn't a huge deal when we were in the other room. If you're from a much cooler climate, you may want it, but I hail from Southern California, where temperatures can reach well above the usual 85F found here.
It should also be mentioned that the Keaka room I stayed in was much larger than a standard hotel room - the lanai was huge, bathroom was similarly huge with separate jacuzzi tub and shower, and the king bed didn't take up nearly all the space in the room. The bed was two twins pushed together, which reminded me of a cruise ship bed - not hugely thick or pillow-topped, but there was a box spring, and it was plenty comfortable. I've had hotel beds much worse.
I laughed when I saw others complaining about the resort rules. Really, they're common courtesy, and not difficult to follow. Want proof? Here they are, summarized: don't hang bathing suits and towels over lanai railings (they'd probably blow away anyway), don't put grease or bones down the garbage disposals, only use the resort BBQs - not your own, don't remove pool furniture, age restrictions on the hot tub - nobody under 16 after sunset (adult swim? Heck yeah), quiet hours 10p-8a, no pets, don't touch the coral reef, don't store bikes/etc in hallways, no fireworks, don't shortcut through [meticulously maintained & beautiful] shrubbery, and don't take home rocks/sand/coral. That's it.
In exchange for following those simple rules, things like towel service, sporting equipment (croquet, bocce, putters & balls, snorkel gear) are free of charge, which was a pleasant surprise.
If I could change one thing, this geek would like to have an ethernet cable that was 10' longer so that it reached out to the lanai. Seriously, the one time I didn't bring an cable with coupler, I wanted it. Oh well, that's hardly a complaint. Other geeks may be interested to know that the bandwidth appears to be 1mpbs/384kbps per person, which is horrible on the mainland, but reasonable if you look up the cost and bandwidth available to island residents.
I don't really know whether it's a decent value or not, as I got it as part of a air/hotel/car combo from Costco. If I do my math properly, and guesstimate on the value of the car and airfare, I'd say we paid about $1600 for 8 nights. Sounds reasonable, though I can't compare to other resorts.
It's calm, it's quiet, and I'm not looking forward to going home in a few days.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.