I am a fan of the Slick Tricks for X-bows. The G5 Mega-meats have also worked well, but I only have a sample size of 3 for those. I do know that even though they sell replacement blades for them, it is damn-near impossible to get them to click into place on the collars like they do when new.
I tried fixed blades on my X-bow when I first got it as that is what I use on my bow, but they plane horribly. Smaller profiles are needed for the speeds at which x-bow bolts are flying at with straight vanes.
