We have a 2013 33aa that we bought when it was only 10 months old, a real baby. It is in great condition and a pleasure to own. It is our first motor home so we enrolled in the driving course at Lazydays in Tampa FL. I highly recommend it and I highly recommend working with Lazydays on your purchase if you can. I have a (distant) background driving tractor trailer rigs so I am very comfortable driving it. My wife also does a great job and usually shares about 15 - 20 % of the driving.
The coach has everything we need and is very comfortable. We have spent the past two winters living full time in it. We tow a convertible on a tow dolly and you'd never know it was there so it's a good thing there is a rear camera. We average 10 mpg but have gotten as low as 8.5 and as much as 11.0. We have a 340hp in ours but I think Tiffin is now using a 360 hp in their newer coaches.
We have had a few repairs, some under warranty, others not. Since the Tiffin 1 yr. warranty was almost expired when we bought it we got an extended warranty from Cornerstone. It paid off. I particularly like the Freightliner chassis. You can have it services all over the country as most Freightliner shops are OK working on MH's.
We attended the FMCA Rally in Springfield Mass a couple weeks ago and looked in dozens of coaches. It reaffirmed that we made a good decision.
Good Luck