Personal opinion, the higher tech you run, the more organic turn over going on, the more you need to keep up with things. Main answer is larger, more frequent water changes, which I agree with entirely, but personally, given that the organic load building is the quoted reason in that situation I can see why people use both it and purigen.
So my answer is, I use it in my high tech tanks, but not in my low tech. I've also used it if the tannin levels from the wood get out of hand.