exaclty the opposite for guys who cant get the free dyno time and associated tune..... $150 covers the gears nothing else.... look at a $500 investment opposed to a extra 3-5psi for free to make pretty much the same peak power....
cam gears are a great upgrade and i use alot of them but for average joe the returns are minimal for you dollar unless you have the contacts.... or do the lot yourself (including getting the timing specs from someone with the same setup) and getting it tuned when you have all the turbo etc fitted.
ive done plenty of back to back tests with cams gears as i have the luxury of free dyno time, i did a write up ages ago on NS.com for SR20 owners... same principal.
id post up a link but LOZ the webmaster smokes dick and im banned for life