I guess you're looking for more info on the 23B, but as far as the 213 goes, we find it to be a great unit. We have used it in early spring and late fall here in Ontario, Canada and we find the hard slide out to be very comfortable. There are no condensation issues, plus it is fairly warm.
We wanted the hard slide vs. the expandable because we have young kids who go to bed on time. If we are sitting by the fire after they go to bed, they can't hear us. Plus as the time when we bought it, we had a toddler and we had another baby after we bought it, so our thought was that if the baby is screaming, at least the who campground doesn't need to hear it.
2010 Jayco JayFeather 213 EXP
2016 Ford F-150, 4x4, 3.5L ECOBOOST, MaxTow, Supercrew, 6.5FT, 3.55 axle