Several members have the 17FQ model. We've been happy with ours and I think that's the general feeling on these campers. The 21FQ appears to be a "stretch" version of the 17FQ.
That couch would be nice I'm not sure the second door adds much. Personally I'd trade it for a closet.
Barry, MSgt, USAF, Ret. & Rose
2017 Ford F150 w/ 3.5 EB
2014 Coachmen Viking 17FQ