I used to think power locks and windows were ridiculous luxury items. I could always lean across my bench seat and pop the lock or turn the crank. But after living with them for some years now, I've grown fond. As have I with my pneumatic drawbar. It's one of those things, like a Reeves drive or a QCGB, that you really can't appreciate unless you've exhausted yourself shuffling belts over sheaves or tinkered change gears. Reaching and holding the brake and wrenching and tapping is now just a button push. It's like honey butter after a diet of bread and water.
I'm a picky bahstahd about my stuff, but the pneumatic butterfly wrench DIY drawbar setups people have come up with are easily as good as commercial units. The $1,000 Kurt power drawbar might have a better coupler on the drive mechanism, but that's a small gain for a one-man shop on a budget. A beveled nut and dished socket on a release spring work fine for home shop duty.