Had a GPR on the TE250, have Scotts on the TE450/under and RS520/over, had a Motosports for a paper weight. (never came through with the stem mount for the IMS tank) Took it back though full pop.
IMHO almost all are created equal, it is the serviceable parts, warranty and customer care that means the most. I have herd nothing but the best and worst from both owners of brands. The slickest set up I have seen is the dial adjustment on the bars next to the grip, GPR makes that. As for the need, NEVER on a MX track would it be that beneficial. High speed street. sand, desert it's a plus, low speed tech it is a nice feature. I love mine and will run them on my bikes. Look at it this way, it's a good investment, if you need the bars lifted a little go under bar, if it does not matter, go least expensive. I have never hit the dam thing with my head or chest.