Without a doubt they are a solid affiliate program and they have a good reputation in the cam world. They used to have the MTree platform before but it is not functional these days but I have to tell you that CamBuilder has got a great white label site builder but obviously you need some other traffic sources since you can not rely on the WL to get SEO rankings.
I have been promoting them, not as much as the CB or LJ and I earn good money with them but LiveJasmin which you can promote on the AWEmpire site is by far my top converting cam program these days and their white labels are the best in the industry. They also offer probably the highest revenue share plans and you can even make up to 45% commission for every client that you refer to them. In comparison, the CB offers you only 20% of all your user spendings so it is more than twice the revenue sharing.
I used to push the CB really heavily on all my adult properties but changes the things and now it is the AWEmpire that brings me the most income and I definitely recommend checking them out if you have not done it already because chances are that you could make much with them than any other sponsor that you currently use.