We had the 366FL for two years and traded it in on a 360PDEK in November. My wife loved the 366FL but it really didn't fit what we needed and didn't feel like home. We love our new 360PDEK and feels like home, actually been using it as my man cave.
The only issues the 366FL gave was a bad hydraulic valve on the kitchen slide, two bad kitchen faucets, dealer replaced one leg of the landing gear due to a leak and the hallway floor had to be raised up. This was all in the first two months. After those repairs were made we had zero issues with it.
The major dislikes for us were lack of basement storage, non ducted A/C in bedroom and have to sit sideways to watch TV. Loved the rear exterior door to the bedroom and the overall room. FR has quit making this model and has a new front living out that is so much nicer.
Overall, extremely satisfied with our Forest River products. Our new one has had zero issues so far and will buy another when the time comes. Make sure you do a thorough PDI and hopefully you'll not have any issue. PM me if you have any questions on the 366FL.
Good luck
2008 GMC Sierra 3500 SLT DRW D/A 4x4 (Big All)
2006 Ford F350 PSD SRW King Ranch 4x4 (Henry) (Sold)
B&W Companion, 90 Aux Fuel Tank, Scan Gauge II, Curt f/m hitch, Swagman XC
2015 Forest River Sierra 360 PDEK
DW Diane, DS Michael, FB Draco and Sabian