There is some confusion here because the thread was about enclosed *relay* holders, not fuse blocks. That said a fused relay holder is great. The idea being mounting relays under the hood for easy access, less wiring (electronic restriction) to headlights.. I wired my Hella H4s with this setup with my first 55, unbelievably bright especially the high beams, I had the street legal / stock bulbs too...
The hella option is nice but expensive.. But that is OK... I can't wait to try out the Toyota or Taurus setup that I posted earlier.. Forgot to look last time I was down at the JY..