Considered them many times but never used them and can't on my WW BBKs.
Had a brand new Motive and cap for the last BMW I was building, sold it with the car when I bought the ST then found out it would of fit
Used a Mitty Vac for years when working by myself but like to put somebody in the car and have them to the peddle pump method, what I learned decades ago and it works and most these days need some exercise