Yes i have three machines from R-tech and i'm happy with them all, a 200 amp tig/stick, a 160 amp mig and the plasma 30c, all work really well and the 2yr rtb warranty was a good deal breaker too, i have also bought many consumables from them and delivery is always spot on though sometimes a little expensive for heavy items, unlike a bigger company like screwfix direct or some of the bigger consumable suppliers they don't offer a free delivery service if you buy over a certain ammount from them but the equipment is top notch anyway and duty cycles are as good as the big make machines which cost about five or six times more.
Happy with mine, 160 arc and a 30a plasma. Nice company to deal with. If your looking for there lowest price it's probably worth looking at there shop on ebay.
Ok the r tech arnt too bad ,what about the different lengths of cutters does that make a big difference with the thickness of steel to be cut i was told long ones for thicker steel or is that more down to the skill of the operator.