So I don't have a basis to compare. But am planning to get the $25-wonder posted about above. Will give you update if I do. Re present performance, am quite happy with power and reasonable fuel eco. Have driven a 525 m50 tho and have to admit it's no contest, they are appreciably faster. My problem remains idling, have changed my ICV already, still have to clean this out periodically whenever I start stalling at idle. Don't know why this is, but don't think it's chip-related. Cheers!