We just did our first real trip... about 2500 miles or so in our new 2013. We have a pretty long list of items heading back to the dealer, lots of fun. We had the regulator on the propane go out, so no propane for the last week of the trip (not to mention losing half a tank of propane), rear air won't run via generator, front air "surges" (looking at a plugged in power meter it just dances all over when the front a/c is on), jacks tend to "leak" and we go off level after a day or so, dash air just isn't cold at all, maybe cool, but no where near cold.
That all being said, it was a great trip (FL to Ohio, then a bunch of places in between).
For those that keep mentioning Tiffen and Newmar specifically....my sister has a 2011 Baystar that we have used quite a bit -- I keep it maintained for my sister. Being able to use it is what convinced my wife we needed to sell our TT and move up to a motorhome. Honestly, we have found lots of smaller issues with it as well. Probably the worst is the counters and the delamination due to water under the sinks -- and this was a brand new motorhome. I will admit, it has MUCH better level jacks, smooth and they are much more stable when deployed.
So, ours goes into the shop on Thursday, hopefully they will address and fix all the issues above and several more smaller (like the original OP mentioned).
2013 Georgetown 351
Much more significant other....
2 Kids and a dog that rules!