I ran across a discussion on another forum where a member had taken a picture of the box his cruzinimage pistons shipped in they were from Taiwan, other people have suspected he is distributing Chinese parts from Japan.
Consider that a good quality US or Japanese made set of piston rings costs more than the entire big bore kit... you have to be suspect of the quality.
I looked very hard at using his pistons in my 1300 because parts are so hard to find, I decided not too after looking into quite a few discussions. However there are quite a few reports out there where these pistons are being used in a number of different bikes and no serious failures have been shown. There have been lots of complains about having to clean up flashing and bad ring fit, etc. some have noted varying weights as well. Bottom line they seem to work.... how long and how well... no one knows...
Here is a discussion form the XS forums:
www.xs650.com/forum/showthread.php?t=26971
If you own a 750 twin cruizinimage is about the only option left, same for a number of older Honda fours, and some smaller Kawi 2 stroke triples.