I've not heard of these, what is it/ does it do?
They have 2 functions. The first is launch control, it basically cuts the spark at alternating plugs at their firing point at the revs that you set that you want to be able to launch at. For example if you launch at 3500rpm, then you'd hold down the clutch, hold the gas to the floor at the engine would build revs until it hits 3500rpm. At that point it would start to cut random sparks to prevent the engine reving any higher. The advantage of this is that the throttle is wide open and as such your making boost prior to lifting the clutch, this means bogging down is less likley.
The second function is the no lift shift. This means you can change gear without coming off the gas. At full throttle you simply keep the gas to the floor when you clutch and shift. As you press the clutch it cuts the sparks for a millisecond or two. Again this means that between shifts the throttle is wide open meaning that the boost dosnt fall away or get dumped by the DV, and so you get no (or very little) lag.
I had one fitted to my MPS and it was great, relatively simple to fit if your confident with a soldering iron. For the money I'd say they're worth it.