Are Gripforce rotors any good?

[So Bay Vetter]

I'm looking at replacing the rotors on my 96 LT4 . There are some Gripforce drilled and slotted rotors for sale on E Bay. The slots don't follow through to the outer edge of the rotor. It seems like that would make them gather brake junk rather than removing it from the rotor. Anyone have any thoughts on this?

 

[WhalePirot]

I have only had one set of slotted rotors on a car and did not like them due to 'pulsing'. After turning them twice they were better. Now I run strictly factory BMW brake parts on it, as a street driver with fantastic stopping power. The slots are for hot gasses to escape under repeated hard braking, as on a track, as you know.