My hope vision 1 failed several times on bad roads and cut out instantaneously & without any warning whatsoever when the batteries wore down. 5am pitch dark & raining is a PITA to be taking the lamp off the bars unscrewing a tight backplate fiddling with the flimsy plastic battery hod, faffing getting the new batteries aligned right first time, putting the hod in just right reassembling and reattaching it all ready to go again, when you can get your cold wet hands back into your gloves.
Cateye volt 300. Unscrew the cartridge battery screw in a spare and away you go, no dismantling, no need for more lights just to see the light you're fixing, nothing to break or misalign, one unit not 4 batteries plus hod plus light housing plus backplate. & the volt has never jolted itself to turned off on a bad track & has a better range of light options.
Each to their own tho, I was happy to offload my Vision 1.