I highly recommend the Roo 23ss. I actually ordered the 21DK as it is mostly the wife and I with our teenagers every once in a while...but if I had younger kids I would definitely do the 23ss for the extra seating space.
I liked the larger bathroom and shorter length of the 21DK but it really did come down to a coin flip and the 23ss offers a little bit more IMO.
As far as community feedback just go to the manufacturer-specific forums. If you go to the Forest River forums there is a very active hybrid group. Jayco's hybrid forum is pretty active as well.