Carefull, saying the GR is just a pre might get you some hate mail around here.
It's a very detailed, great sounding pre-amp minus the bells and whistles of a channel strip. Since I almost always lightly compress vocals while tracking I had to add a RNC compressor which works real well as a team. GR also makes a very nice e.q. intended to work in conjunction with the pre-amp (or by itself) but the price per channel would be quite a bit more. I had the chance to A/B the MX-60 with the GR and there was no doubt that the GR was cleaner (with the option of grit by adjusting the gain stages), had more gain, and better detail. But like I said before, it didn't render the MX-60 useless, just seem to make a great combination.