I have a set of clone rails and 2 sets of original hiwin's I honestly can't tell the difference so I think it's a matter of time after a year of hard work we shall have a better idea.

The clone rails were 1/3 the price of new Hiwin's.
http://www.ebay.co.uk/itm/15-1500mm-...UAAOSwez5ZvxoH

I paid £100 early in the year but I noticed since the brexit fiasco prices have gone up and back down a bit they peaked at £160 about a month ago so variable lol but Germany shipping so no import tax and were shipped in 3 days.