Difficult, are the US ones better, definitely. Is the price difference proportional to how much better, probably not. But used they’re anywhere from £900 - £1200 depending on series & condition. That makes them a goer imo, and if you’re not keen you can then move it on for the same money shelled out. I’d def take the plunge (I have to say that, I have a good few, though will be putting 2 up soon).