Interesting comment from Fin. The Cross American, or Recoil, from Ed Valentine might appear to be new to some, in its UK version, but it's been around for some time with the " turbo " option.
I owned a Stimvak a few years ago which I always felt could be upgraded along similar lines, but possibly the market in the UK is too small for anyone to take the gamble, so we get a series of imports, which are rebadged and doubled in price.
I've also been following the advances, in o/p machines for some time, and wondered when someone would bring them into the UK.
I experimented with the little Oreck, but it's just a toy
robbie