I've not yet seen one, but our Coachmen dealer stopped carrying motorhomes in that brand a few years ago (still carries the towables).
Prism looks a little taller, wider, less aerodynamic than other C's on the Sprinter chassis. Have you looked at any of those from Winnebago, Forest River, or Fleetwood?
Another small motorhome on Sprinter chassis to look at would be Winnebago's Via,
similar in size and performance to View, Prism or a Sprinter Jamboree/Tioga, but with the front seats incorporated into the living area, rather than being lost space except while driving. That can make a big difference in a small motorhome.
RV Trader shows Prisms in stock at RV World, Lakeland and Nokomis stores. RV World also has Views in stock, new and used, for a same-day comparison.
I've liked working with Dreamland, in Bradenton, who carries Thor lines, but they don't show any Sprinter C's in their current stock.
I see that the Prism (and F-R Solera) run somewhat lower in price than most of the Sprinter C's introduced into the market earlier. It also has more basic, lower cost construction with less use of molded fiberglass bodywork for streamlining. I would expect a more basic trim on the interior, this model does not seemed to be aimed toward customers down-sizing from expensive class A diesels, as the first Sprinter C's were targeted.
You can likely make up most of the price difference by looking for 2-4 year old used C's from early adopters like Winnebago, Gulfstream and Fleetwood. Low mileage 2009's are selling for 30 to 50 thousand less than MSRP of new 2011's (which should be be clearing out as dealers take delivery of 2012 models in the next few months).