In 2014 my wife and I were also debating a new 3605 vs a used 2013 3895. We decided on the 3895, and due to unforeseen circumstances ended up living in it for all of 2015. Having had a chance to walk through a 3605 after we had been fulltiming showed us that we had made the right decision. The 3605 would have been too small, even though it's just the two of us, and we would have been trying to deal with all the warranty claims. With our used unit all I needed to do was catch up on maintenance not performed by the previous owners (adjust brakes, lube everything, clean and re-seal roof, etc.). I also spent my spare time and money upgrading all the features found in each new model year 3895, such as the theater seating and coded entry door locks. We bought our unit for half the new model MSRP, the only danger being no warranty. In the end I feel we made the right choice. We're back in a sticks and bricks home, but have very fond memories of that time, and still look forward to camping trips throughout the year.
2013 Voltage 3895
2011 Ford F-350 DRW w/ Firestone airbags and heavy duty compressor, Edge Insight CTS, Curt Q24