I moved the thread to the Roo subforum.
Although the 25RS is quite a bit different from a traditional hybrid Roo, it still qualifies as an expandable because of the bed slide.
That's a nice floorplan in either model. I note one major difference is that the Keystone is about 1,000lbs heavier fully loaded. This could be a make or break depending on your tow vehicle. In fact, its dry weight is 1,000 more, too, so this should be a consideration for you.
Issues to watch out for will be the same as with any TT. This one essentially has two slides so seals and slide motors are important. I assume because they are 2012s that you are buying new so the warranty should cover these things if they should fail.