I had a MiOx type purifier for a while, it was pretty neat and light, but worked the same as any other chemical treatment, and still made the water taste like a munincipal pool. I wasn't very impressed.

I was also always scared to use it because I could never work out how to purify the water outside my dromedary bags after they'd been filled: the water not in the bladder, but along the mouth and near the opening could cause major contamination problems.