new commercial XGRASS?

Does anyone have any experience with a product produced by
GPZ Technology, "GRASS with X/Motif interface"?

If so, how is it different from the old XGRASS - has
it been ported to more recent Motif libs or is it
an entirely new product or is it just old XGRASS for sale?

Their web address is: http://www.gpz.com/
but there's not much info on the GRASS product.

Thanks,

Bill
brown@gis.uiuc.edu