I have used VSA for pretty much everything I've done. It is fairly easy to use ,especially if you use some of the software from Monkeybasic. I checked my version and they do have a servo and relay option for using the Maestro controller. I have heard of some people having trouble with long runs of servo cable but I was running 3 3 axis skulls with 2 axis eyes in 2 of them for a total of 16 servos on 15' cables and had no problems other than a mass of wires. I was using 2 parallax servo control boards. The learning curve with VSA really isn't too bad. The nice about is that you can use the Wave Motion Analysis to get the audio tracks done with a little tweaking fairly quickly. I haven't used Vixen ,but from seeing what it takes to do one song to lights it seems a bit labor intensive. I heard they were coming out with a servo controller version, not sure if it ever happened. Just my 2 cents worth.............