I don't have any comparison experience but I would never buy a tablet that isn't from Wacom. They have a long time in the market niche and I don't think its a big enough market for other companies to devote a lot of engineering to.

When I chose my first one (the smallest Graphire) artists on Concept Art and other web sites said wacom. I rejected any designs that needed batteries in the mouse or wheel first. Who wants one more thing to need batteries for? I think I was looking at an "adesso" and the wacom. I've been very very pleased with Wacom then and since.

Sigurd