I couldn't find the BMWP SSK so I did the UUC Evo 3+DSSR. I very much like the shorter shifts. The shift effort is a little higher but the shifts are very crisp without the slight vagueness of the stock shifter. There is no in gear slop at all it feels very tight and precise, when people say bolt action this is what they mean. I measured the shifts at the standard height of the lever to be about 2 inches(3rd to 4th) using the method described earlier in the thread. It will obviously get shorter the lower you adjust the shaft but it is perfect for me as is.
When buying the DSSR I was a bit confused by their website saying post 1/2009 builds used a different DSSR. I bought the 86mm one as that is the one the site I bought from recommended. Luckily I think it is the right one because I didn't have any problems and it was about the same size as the original.
The install wasn't as hard as I thought it would be. I did it on jack stands in my garage in a couple of hours. The directions from UUC were clear and easy to follow. The only frustrating part was putting the screws in. I wound up wrapping them in painters tape to extend them flexibly and then it took me maybe a minute or two each.
Overall I would say its a good kit. I picked up the kit on sale and I would say it was well worth the price. I would definitely recommend this kit to anyone wanting the BMW Performance shifter but can't find it. I have had this car going on 6 years now and I whish I did this earlier.