Stayed here in late Aug 2010. Room was on 23rd fl, overlooking the backside of the hotel (so had a view of Circus Circus & the Hilton), obviously would've preferred a view of the other side of the Strip but was happy I had a higher floor room nonetheless.
Spacious & clean, but I would have to say I prefer the Wynn over the Encore. Overall decor & size of room & size of bathroom were better at the Wynn. Everything else was great, service was impeccable just as it was at the Wynn.
Only complaint was that my room had a funky odor I couldn't identify (kind of smelled like feet - ick). And by the time I really noticed it, I was already unpacked & too lazy to re-pack everything to move to another room. So I bought some room spray from Bath & Body Works & rid the room of the smell on my own haha.
Also, the pool: 1 advantage of being an Encore guest is that you have access to both the Encore AND Wynn pools (Wynn guests only get access to the Wynn pool & not both). I prefer European (aka topless) pools & found the pool much bigger & better at the Wynn. Encore's was nice, too, just harder to find a chair b/c it's much smaller than the Wynn pool.