Need a recommendation for a gate starting system

Do you just need a gate release or do you need to replace the whole gate? Might help to know what brand of track as well?
 
Has anyone used the full motion starter?

Thanks,
Reading the notes on that, the first thing that stands out is that you have to set the springs to the right tension for four, 5 oz cars and then tweak the adjustment if you run fewer, lighter, or heavier cars? So if your event includes Unlimiteds over 5 oz or if you want to test just one car you have to tweak it. I'd be afraid that it would affect the consistency of the track, but you could probably attach multiple anchors for the springs to the track and mark what each is for?