I just installed the bmw ssk about a month ago, day and night difference over stock. I dont have any exp. with uuc or other brands, but extremely happy with the quality of this product, price, warranty, diy install is very easy and not to mention when you bang gears its just awesome!
Edited: My next mod is cdv for shizzle.
2004 RIP 92 Supra 7MGTE
2009 RIP E90 325I