Mityvac recommendation

[benmack1]

Simple question. I keep reading about mityvac (or is it mightyvac?). I did a quick search and it seems maybe there isn't a single 'mityvac' but rather tons to chose from (many models even on mityvac.com, but also many vendors of similar units).

• Can I have some recommendations on what to buy (model, brand and vendor)

• what is a good/fair price to look for

• do these things work as both vac and pressurizing units?