Velocity stack= good, bad or ehhh?

[Rexx Shyt]

Do velocity stacks do any good or is it just a waste of time?

I was considering buying one but I don't want to waste my money. What do you guys think about them?

 

[Venice Motor Bikes]

Here's some answers for ya... Velocity stack - Wikipedia

They don't do jack on these little carburetors... but they look kinda cool.