Well JeepHarley, I guess your gonna get responces both ways. For me I went with the up-grades. Parts are parts. By that I mean your gonna be replacing them anyway. I don't think the replacement stuff cost more for the up-grades. If you use Esky anyway.
They are pretty easy to get also. I'm not sure how easy stock parts are to get cause I don't buy them. Frathering shafts are cheap and easy to replace.
My advise, If you go with up-grade stuff then DON'T get any super tough stainless steal replacements like shafts. This way you won't break the CNC up-grades. Better to bend a shaft them to snap a blade grip!!
I'v got in down to replacing the F. shaft in about 60 sec. I simply remove one allen from one side (of the bent shaft, inside the blade grip) then put it in the new shaft and then push the bent one out with the new one. BAM done..