From the looks of things, the R50A doesn’t appear to have a bright future:
I’ll start out by just saying that I’m disappointed in the R50A. It is hard for a product like this to really succeed though. When you think about it, the R50A tries to fill a niche within a niche. Unless you are specifically looking for a handheld device that can only be used as a slate, I couldn’t recommend the R50A to you. I can’t think of many situations where a full sized slate, or convertible Tablet PC wouldn’t be a much better alternative than the R50A. Unfortunately the UMPC form-factor and slate PC concept just don’t mix well. What you end up with is a device that can’t be held with one hand very comfortably, and even looking beyond that, has a very small writing space (compared to other full sized tablets out there).