I've made money with them under the old name of Cognigen, an affiliate/MLM crossbreed. The program was and is free to join, which makes it one of the only fair network marketing situations out there (so newbie members who are going to flake out anyway don't lose a bunch of money in start up or autoship nonsense).
They are very good at keeping a disparate group of vendors together in a kind of telcom mall, and quickly eliminate those that aren't paying their affiliates. Their weakness is a rather sparse training back office that is not kept up to date for the most part. Some of the vendors also don't provide the cheapest deals, so you have to market them based on the quality (in a few cases like 1 & 1, ahem, a questionable prospect). If telecom is your thing and you can stay below the radar employing BH, you can do okay with them.