yeah, if you are aiming for high rev/boost/power setup its probably a good upgrade..though I have read of issues with leaning out on certain cylinders...the rear i think it was, I dont recall any "Factual evidence"
I think where they failed is people were slapping them on streeters thinking it was a huge upgrade but in reality it was pointless, with the only benefit being easier plug changes.. ...If its on high rev track car it probably wont do any harm...question is will it do any good on your specific setup...
Way i see it alot of big power setups use them so they cant be all bad...But on your drifter Jez (if thats what its for)...probably not worth the effort as you might gain a little up top and may lose low range torque and response..robbing Peter to pay Paul so to speak...
I bought one for my car but when I looked into it benefits (or lack thereof) and the effort involved in swapping it over , I sold it again
However if I had a huge turbo and planned to run 2 bar through it I would be more inclined put one on...