IMHO the RJC product is a much better product. The only drawback I have with it is that it is really heavy. I sold a CAS V2 FMIC that was a little smaller, but apparently the quality of the RJC unit comes at a price.... in the heavier thicker materials Jason uses.
I think the CAS V1 would be a nice piece (don't think they are being made anymore), but since I have not directly compared it (size and wt) to the RJC, I can't say if you would get close to the area with less weight.
As a rule, RJC's products are very good quality..... hard to go wrong there.