Hi sailers35,
There is one thing the Sprinter cannot do. It cannot be used on any PC models other than the 2350 and 2400. This is because, unlike the Ford E350 and E450, the Sprinter frame cannot be adjusted in any manner. So it is locked into only those two models, 2350 & 2400.
About a slide out. Most everyone likes them period. There are a few like myself that intentionally avoided a slide out. I have my list of reasons, but I think the greatest consideration is how people use their PC.
Some people spend a lot of time in their PC, like being snow birds for example, traveling south in winter. Their PC becomes home for a good long while and the people enjoy life at home in their PC just like they would at their brick & mortar house. So for them the room inside is greatly valued. The roomy interior offers great comfort and elbow room. Many RVers travel with pets so the roomy interior becomes even more valuable. The extended weekend warrior type love to get away from regular life, kick back, grill some good food, watch a fire dance, and enjoy the company of family and friends. A slide out helps make that experience that much better.
Then there is another way people use their PC, like my wife and me where a slide out just doesn't contribute so much. The only time we'd hang around our PC for the day would be because of really bad weather. Otherwise we are out all day every day in our tow vehicle to trail heads and sightseeing. We come home to our PC after dark, eat, do a little relaxation, maybe watch a movie, then it's off to bed. About 1/3 to 1/2 of our vacationing nights are spent on the road in places like Walmart parking lots and rest areas where having a slide out hanging out for another vehicle to hit it is a really bad idea. It is also a strong signal that we are there for the night, something I prefer not to advertise so well in some places. So for our travel style along with my list of piddly reasons, a slide out isn't for us. Mind you, it would not be a disaster for me to have a slide out. I just strongly prefer not to.
Now if we did the snow-bird thing every winter, I could feel quite different about having a slide out.