I have two headphone amps, a Rolls RA62 and the Furman HDS-6 with two of the HR-6 mixers.
I like the Furman distribution system as it allows the users to blend up to 4 submixes with the main mix. For the price, it is well worth the investment if you are recording groups.
The Rolls is a basic 6 channel headphone amp. No bells or whistles, but it is pretty transparent.