Winnebago actually came out with the Profile/IQ/24G style coach in the 2008 model year. (we had a 2009).
The first 3 model years didn't have the side slide on the drivers side. We loved ours, but did recently go down a size to the ERA class B. The only thing we really miss about the IQ we had is the larger bathroom.
Nice units. Lots of used ones around if you look.
Our ERA class B actually has more interior storage than the IQ class C did believe it or not.
There is no such thing as a B+. It's just a marketing term used by some manufacturers, usually to designate a no over the cab bed model