How good would you rate these converters, are they up there with Apogee? I was told they are decent but not as good as Lavry or Mytek. Any reservations?

I am thinking about getting the SPL Mixdream (and Great River EQ) and summing outside the box. I can get 16 channels from Lynx or 8 channels of Mytek for the same price. If I go the Mytek route, I could sum 8 channels at a time, compared to the 16 at a time with Lynx. Hmmm.