I wouldnt be worried about any failures. Perhaps if you made some decent power and used the Intense shfit kit on the hardest setting and you beat the piss out of the car alot, then a failure could become an issue.
I'd recommend the trans go shift kit over anything. They do far more good than bad. Increased/faster shift times do help the wear on the clutches and the trans go kit is not harsh at all.
I personally have the ablity to custom tune my PCM and increase the shift times and pressures even further and it's not a cause for concern on a healthy transmission. Hard parts could break at anytime but it's mainly do to more power being added.
