I have a fuse 23a. After 2 nights in the coach so far I would say it is just about right. Not too large, not too small. You could loose the slide however since it is plenty big enough inside without having to open it up. It would be nice if it had a diesel generator so it consumed off of the main tank as opposed to the LP. Key for me is the beds are finally big enough.
To be very honest, it drives really well. No complaint with maybe 1000 interstate miles under my belt. no significant miles yet on smaller roads. Much better than the E series. Sprinter from the very little bit I drove felt much bigger. Never test drove the Promaster to compare.
There are some more thoughts on my blog at http://confusedrv.com
