I bought this kit a little over a year ago. It performs exactly as advertised, quick throttle response for sure. But, the quality of the external parts is pretty poor. I keep my bike outside almost all of the time and it gets hit by rain. I don't typically let it sit wet long, but I can tell you now that the aluminum pieces are rusting heavily on my bike. Guess the title says it all: for track use only. Don't let it get wet and expect it to look good for long.
Also, very difficult to install on my bike (2008 CBR600RR). Had a bear of a time getting the airbox back on with the thicker cables that came with this kit.
The amount of adjustability is great in terms of cable slack, but they made the metal pieces too long. I had to move other pieces on the bike around so that it wouldn't hit/rub on the fairings.
No problems with MotoSport though. I had great delivery times, easy customer service and great prices. I will be shopping here again, but next throttle cables will be a different brand, for sure.