Boost Controller

[SiZe]

I have spotted this on Ebay and was wondering if anyone here has any experience with them or know if they are any good?

http://cgi.ebay.co.uk/R-Spec-BOOST-CONTROLLER-FOR-VAUXHALL-ASTRA-COUPE-TURBO_W0QQitemZ8030225253QQcategoryZ72205QQrdZ1QQc mdZViewItem

[K3FUS]

Waste of money

[Vxcoupe16v]

from what ive heard manual boost adjusters are bad news if you dont know exactley what you are adjusting it to