>Sure,
>They work fine.
>But why waste the money?
>Open the bleeder screw, and let the brake fluid flow.
>Gravity is a better deal.
>Just be sure to watch the master cylinder---keep it full of fluid as
>gravity does the bleeding.

Or make your own. Use reasonably stiff rubber hose, block the far end
thoroughly (a bolt pushed in up to the head does the trick); use a scalpel
or razorblade to put a short (say 5mm or a bit more) CLEAN slice into
either side of the hose just above the bolt.

Push onto bleeder screw, immerse hose blocked end in container of
brakeliquid and loosen bleeder. Go to it! It works so long as the hose
slits are clean enough to seal between pedal-pushes.