i'm with skycat on this one.. you've probably ridden in the v1's, which are the ~<1k models (still better than 99% of stock setups),.. which are about on par with tein superstreet ($1500ish) FYI.. in fact, tein superstreets are total balls, would not put on lawnmower for the price
erformance.
the BR's are usually about $500 more, and the ER's another $500 on top of that.
ED: definitely interested in purchasing a set if you'd say they're comparable to kw and such