I've only used the mini jack once so far. For $30 it does the job. If I had the space I'd get a full size one. My deadlift is nothing to be proud of at this point but with the annoying ribbed finish on the sleeves of the B&R bar the lift makes it a lot easier to get the plates on and off.
I think I will try to get another set of j hooks. I'll keep one at squat/press level and one at bench level.