I love bagless, it is perfect for my use case. I have Huskies and fill up the canister multiple times per vacuuming of the house. The majority of my vacuuming is just picking up hair, not dirt. I'd fill bags up so quickly, and I've yet to find one that is replaceable as quick as a bagless canister can be emptied.

It's not a sham, different use cases call for different things.