The view from the strip side of tower 3 is the best Signature offers. Because of Harmon Avenue below, there is a perfect view of the new City Center Complex, The Cosmopolitan and Planet Hollywood. To the north there are clear views of Paris, Bally's, Flamingo, Venetian, Wynn, Encore and the Stratosphere from the floor to ceiling glass. While tower 3 is the farthest from the MGM complex, it is connected by climate controlled walkway with moving sidewalks so it's only a 3-5 minute walk from the Tower 3 lobby to the MGM Studio Walk depending on your pace. In addition, being right off Harmon avenue, it is a short walk out the front gates at Signature down the street to the PH Westgate Tower where you can enter that property and be right in the Planet Hollywood miracle mile shops. Walking through there and the main Planet Hollywood casino will place you on the strip right across from Bellagio and adjacent to The Paris!
Personally I use the onsite exercise room daily, and the free wireless internet for my guests is widely appreciated (there is nothing worse than having to pay $15-20 to check your e-mail!)
Each of the 3 Signature towers has a pool and hot tubs. The pool in the middle (at tower 2) is heated year round at 85 degrees and gets plenty of winter time use. Guests can also use the very nice MGM pool during season at no cost.
The hot tubs are operational year round, including of course the ones at the tower 3 pool, and are nice in the colder months.