vtec controllers?

does anyone know anything about vtec controllers and how they work...?
if anyone could shed some light on the situation it would help, also iv got a 98 accord with the v6 3l vtec motor and wanna know if these controllers will benefit my car enough to justify the cost and how much power can be pulled out of it.
also other then cost is there any down points?

http://www.ozhonda.com/forum/showthread.php?t=46718

http://www.ozhonda.com/forum/showthread.php?t=41109

http://www.ozhonda.com/forum/showthread.php?t=33495

http://www.ozhonda.com/forum/showthread.php?t=26663

http://www.ozhonda.com/forum/showthread.php?t=18927

http://www.ozhonda.com/forum/showthread.php?t=19663

http://www.ozhonda.com/forum/showthread.php?t=13027

http://www.ozhonda.com/forum/showthread.php?t=2399

If you look at the bottom of this page, there are many threads asking this same question. So there is no need to open another one.

http://www.ozhonda.com/forum/showthread.php?t=46718 This thread pretty much explains why it is useless and non-beneficial to change your vtec rpm on a stock engine.