I just started using the Custom, which is good. All of Custom's "black label" product is good though.
I've always used Knorr in the past, with good results.
Knorr's powder mix though.
They also have a frozen demi that I don't care for.
Mostly because I am using it for, say, a brandy peppercorn sauce, I usually reserve some of the called for water, giving me the consistency and richness I am looking for.
With the frozen you can't leave out any liquid.
I've never tried Minor, but I would imagine that if it's the same quality as their top-of-the-line bases it would be good.
Sounds like that's the case.
Slightly off topic: I really abhor the lower end bases from Custom, Minor, etc.
Basically flavored fat.
Knowledge is knowing a tomato is a fruit. Wisdom is not putting it in a fruit salad.