has anyone had any experience with these? i like the idea of two rev limits one for launching the car and one for normal use.

http://www.bigccracing.com/shop/product.asp?idproduct=216&source=thumb

I'd get one of these

http://www.demon-tweeks.co.uk/performance/shift-lights-rev-limiters/omex-clubman-rev-limiter-with-launch-control

Can be had cheaper on eBay to

the car currently has a normal one fitted without launch control but i dont think a lot to it if its even working.i would like to try something diffrent as i have no confidence in them.