I have an SMC kit and I think I was one of the first in the area to go alky. I was new to the scene and was looking at new things. A lot of the old crusty dudes in the area were saying it wouldn't work and that I'd blow it up. Had one problem with my kit in 4-5 years and steve took care of it. I never really had to bother steve for tunning issues as I'm only running 12.0 @115mph. Steve probably wouldn't want me to say this, but I upgraded from a single to a double nozzle and after 3 attempts at paying him I finally gave up. He wouldn't take my money. It was only about $25, but I still like to keep things square.
On the other hand, I would not hesitate to buy one of razors kits. The 2 kits I would recommend would be smc and razor. In fact I may move my smc kit over to my DSM and put a PAC system on the GN. I want to hit 10s in the GN on 93 and alky it pure street trim (stereo system still in car).