I think that CPU is an x86, meaning it'd be hard to get software for.
It's better if you pick the 980 or 980X models. BTW they look similar to the Viewsonic products, not sure if they're the same.
Either way, these are way too expensive IMO. There are many other similar devices, usually sold on eBay. But as there is no real keywords to search for them, nor a proper category
(Tablets? PDAs?
), they are sometimes hard to find.
For example someone posted this one a while ago, which is IMO a fair price:
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=6778739189