I used my batch of 777 the other day and ended up with some nice negatives. Bluegrass makes 777 developer, and also 777 replenisher. Before I bought the replenisher I used regular developer to replenish, which worked well also, but now I use the real deal for better capacity.
I find now after having used the developer for about a year, that I love how it renders midtones, and it's forgiving in a sense that it's almost impossible to overdevelop highlights. The more I use the develop the more I push the boundaries of printable highlights, and I find that right on the ragged edge of blocking up the highlights, by using much longer than recommended developing times, I get these amazing highlights in my prints. Love it.
My film of choice is mainly Ilford HP5+, which suits the developer very well. My girlfriend shoots Tri-X, which also works extremely well. We've also used it with TMax 400 and Ilford FP4+ with tremendous results, so I'm very happy with how the developer works.
With that said I'm thinking about buying some Edwal Developer 12 and start using it again. It is totally different from 777 in the midtones compared to highlights, where if I develop the negatives to similar overall contrast, the mid-tones are darker with Edwal 12, creating a different darker mood. Shadow speed is about the same. They would complement each other quite nicely, I think.