We have a '13, 2109S, Mini Lite, purchased new. We have all the options available and love it. Haven't had any problems other than the tires - replaced them with real tires! The Serta queen has a heated mattress. But we've never been able to make it get warm. Another issue is the insulation or lack of. We had a LOT of condensate running down the walls at every beam, on the window frames and dripping from the vent frame in the ceiling.
On the plus side, we really love it and were in it for 40+ days in a row without feeling claustrophobic. I know nothing of the other units you mentioned.
We're trading this TT in for a CC in July when it comes in! Only because we're going FT.
Alan, Kathy & Cooper the camping cat
2014 Cedar Creek, 36CKTS
2013 GMC 2500 Denali
Full timers since 5/30/2013