Weyless designing the future was the slogan. The rollers are good, suffer from limited wheelbase adjustability and not easy to store. The marketing name has been reborn. not easy to ship as the rails add up in size for the dimension/weight max. quickly. Best price phishing would be on ebay probably. the drive belt awol is a possible problem as modern rollers have various diameter drums.
There was an original option for sidecar foot rests to ease starting to ride...