If you're gonna do it, make sure you know what you're doing or have a pro put them in. I've got them in now, but managed to crack the vaccuum pump driven by the exhaust cam in the process...on the bright side, it gave me a reason to take the head off, get some headwork done, and order forged pistons from GS. it's all getting done at the same time along with green giants, adjustable cam sprockets (advanced 3-4 degrees), and a retune from JZW for my recent w/m install and all the aforementioned work. I'll let you know how it all goes down...and if there's time, i'll try to snap some pictures.
but in a nutshell, if you've already got em, go ahead and put them in. I think Nick's experiments with just putting t5 cams in showed some increase in the middle and up top, witha little loss down below, hence my reasoning to advance them 3-4 degrees... but whatever you decide...good luck!