I think it's well worth the upgrade not that expensive either compared to going "proper" BBK like AP or Stoptech.
I had issues with fading after a few sessions on track (this depends on the track obviously!) - Mine have been mostly a lot of corners and heavy braking etc. Though I'm pumping a bit more power then standard also put strain on the brakes. Though braking technique is also a reason, might need some work if you have brake fade with proper pads, discs, lines, fluid on Brembo. For me they just got to hot and as a result faded. the bigger sizes of the akebonos really help, only had a chance of one proper track session since I fitted them but really enjoyed them and zero fade!
If staying brembo I'd look at some sort of brake ducts to keep the temps down.