My zergbusting gadgeteer uses that ability and it's actually two skills- you get boon strip on the toolbelt as well. And technically any class can remove boons with sigil of nullification.I said almost. Engineers remove boons too. One skill isn't as impressive as all the ways mesmer/necro have to do it.
I'd place boon stripping into these tiers:
A) Mesmers- you can expect all good ones to have it and it's vicious.
B) Thieves and Necros- you can't expect all necros to have it, but when they do it's vicious. Whereas almost all thieves will have the trait but it's very situational in its application. For example, a good thief with the right build can interrupt a stability stomp. Plus sword thieves steal boons.
C) Engineer- but no one seems to run gadgeteer except for me.
Z) Sigil of nullification.