Do VTEC Controllers really work?

I noticed some of these on ebay saying you can set when your VTEC engages..

I was wondering if anyone has ever tested these out and if they work good.

yes, but I think they're a little more than you think, might wanna read up on them a little bit. :)

vtec controllers come in handy when you are getting cams that recommend a different vtec cross over point, etc. also many can control fuel ratio as well... probably would be best used if you have access to a dyno to tune it after install

kicker, I think I need to join your crew... I can't seem to say anything these days without some @sshat trying to tell me I don't know my @ss from a hole in the ground!

kicker, I think I need to join your crew... I can't seem to say anything these days without some @sshat trying to tell me I don't know my @ss from a hole in the ground!
yeah, join in, all it takes is 2 minutes in paint and you're in :D

yes they work i think there good on turbos, because you can raise the vtec or lower the "kick in" point to make it work better for you setup