Auto beat-mixing is over-rated. It only really works for music that has true 4/4 beats. If you are mixing house, hip-hop, or any other electronically produced beat; it might work for you.

I have tried a number of different products out there, but I have found that if I didn't already know how to beat mix my mixes wouldn't come out as I wanted. If you are confident in your beat-mixing skills, then ABM will be of great benifit to you. It gives you the freedom to set up playlists and read your crowd. If you're not too good at it, I suggest practice until you get it down on your own and then look for that type of software. You don't want to depend too much on ABM; it might come back and bite you in the ***.

Here's a link for some available products. Many of them claim to have ABM. Those that do, all claim that it works.

http://www.mp3machine.com/win/MIXING-DJ/