I've had mainly cliffords.

1 was on my crx with remote engine start and all the bollox on it and it was perfect and still is to this day as my mate owns the car now.

2nd was on my nova and that fucked up but it was a very old system

3 is on my current car and is spot on.

I'd recomend them bt as gurne said they need instaling properly or they will give bother