I like the SLS Hotel's rooms, they're spacious and stylish.
I've not taken advantage of their amenities such as the pool area.
The restaurants seemed a bit lackluster, and in part maybe because I get a sense that the SLS has a "Los Angeles Theme" to the design, and being from the LA area, I don't have any desire to eat at Umami Burger (in LA at least, I find it to be over-rated) and then they have a Chinese (Ku Noodle) spot with menu items 2x the price and probably 1/2 the portions of what you'd be able to get in the San Gabriel Valley or Chinatown, and then they have a Japanese (Katsuya) restaurant, a Steakhouse (Bazaar Meats), Pizzeria (800 Degrees) and some sort of comfort food (Northside Cafe) diner. I can't really rate the restaurants other than from a lack of appeal standpoint, since I never tried 'em. I was told they once had a buffet, but due to, I think lack of patronage (customer support) it closed down.
The room rates seems fair for Las Vegas and is in that middle layer. It's not the $20-50 rooms you get a Circus Circus and the soon to be demolished Riviera; and it's also less than The Wynn, Encore, Palazzo and Venetian's $75-200+ rooms. Prices vary based on the time of year, day of the week, promotional specials, etc. as well as if you go online to Expedia, Orbitz, Trip Advisor, etc. Generally it's on par with places like Treasure Island, Bally's, etc., but the rooms here are really nice, modern, new and up to date.
How I often rate rooms is by the shower. If a shower/tub combo, I say "nay" if a stand-up shower, I say "Yea" - this has no bathtub, and a spacious shower in a rather large bathroom area.
The hotel staff are friendly and accommodating.
The location is, well... at the far end of the strip. If you're going to the CONVENTION CENTER then this is probably one of the best hotels to stay in. It's about a 10 minute walk or so, maybe a mile from the hotel to the convention center.
If you like life on the Vegas Strip and to walk up and down to see the sights or troll for hookers late night, then this may not be a great place... even the prostitutes are too lazy to come this far out since their main bar area didn't seem to have much of that action... not that I was looking for it. So, it's a more chilled out and relaxed environment, even the casino floor, which is spacious.
I can't rate the casino other than saying I had bad luck and lost $60 in craps within minutes and it wasn't my night. I placed some sports bets with "futures" wagers of some long shots, so that could be my saving grace at the end of the year if/when the Atlanta Braves wins the 2015 World Series and I cash out on the 50:1 odds...
Overall, I'd return here and stay at the SLS if the room rates were competitive or lower to their peers.