I don't like them. I always feel like we lose out on 50% from our cash/value when cashing in such tournament. A huge part from the bounty prize pool go to the first place finisher too, which make those very top heavy. Altho its nice you can bust before the money and have cashed some in bounty's i still like to play for a final table finish in a tournament, earning a big score, but not placing first makes us lose out on double our cash. They seem very profitable though, as i think many bad players are spewing off their stack in this tournament format. I'd still prefer a normal freeze-out tournament.
Also when multitabling it is prety annoying and hard for me to have a complete different strategy in a knock out tournament. Having to pay attention to the stacks on the table every hand you'd normaly autofold. Therefor i rather not have those kind of games in my schedule.
I can enjoy them at times tho, but not with many tables.