After a year and a half, we are as pleased with our 26LRSS as the day we took it home. You will find the North Trail's design and construction quality among the best the industry has to offer in TT's. The 29LRSS is a "stretch" version of the 26LRSS floor plan. I believe you will find more space in the bathroom and around the bed.
What set the 26LRSS apart for us is the spacious floor plan in a 26 footer, the plentiful glass, ample interior and exterior storage, and the robust GVWR (8600# GVWR compared to an as-shipped dry weight of 6350#).
There a number of active 26LRSS owners on the forum, as well as some recent purchasers of the 29LRSS. If you have some specific questions, someone here will have the answer.