I have one . You need it for some transmissions that fill from the bottom. Also works great when doing trans work. Suck the fluid up trough the dip stick tube and eliminate the mess when dropping the pan.
Ours works great , I couldn't see not having one now. Flip the switch and you go from pulling it out to pressurizing it in. So you get the best of both worlds. It "sucks" and it "blows" Doesn't get better then that
