Taters, I am a fan of Synergistic Research. I have heard the MIGs in both my system and a few others. Used under amps, DACs, and transports. Both myself and the other users felt that they made a worth while improvement for their cost.
But, I and a few of the above users have also tried the Stillpoints Ultra Mini footers. Yes they are more money, $375 for three vs $150. However, they out performed the MIGs in all aspects. The harmonics and decay of notes, the air around the instruments, the reduction of distortion in the sound of the music. The instruments sounded more like they do in real life. It also had a better sound stage and more holographic. Now this was not an OMG it is so abvious but it was noticeable. Once I replaced the MIGs with the Stillpoint Mini I did not want to take them out.
Now do not get me wrong, the MIGs give you many of the above benefits, just not at the same level as the Mini. Now not everyone felt that way, some preferred the MIGs. So as the saying goes YMMV.
So go with the one that fits your budget. You can not go wrong with either one.
PS The above were done in various members systems in a local Audio Club we all belong to in the NJ/NY area.