I have Raybestos slotted on my Ram with no issues but the slots are not straight lines, instead they are curved.
I put powerstop slotted on my 300M and they are terrible. When new, under moderate braking they made a whirring or rumbling noise. I got used to that over time. After winter and when salt started attacking the coating of the rotors and the braking face was getting pretty rusty they made noise all the time. To the point where I could not take it any more. I tried removing and cleaning out the buildup of debris in the slots. That worked for a while until the rust came back.
Ended up putting on a plain old cheap set of rotors.