I use my RADAR as the front and back end via a MOTU 2408. My conversion doesn't suck. I have a couple of MOTU 1296 units here for aes i/o at 96k. I have never had the need for 192. That's another Dan Lavry issue.
I'm local to MOTU, and have been using Performer for 20 years, and their customer service is terrible. Terrible. I've never liked dealing with them. Every tech I've ever spoken to there assumes I'm an idiot from the word hello.
I'd like to compare the Apogees to my RADAR... that would be interesting.
I'm glad that Apogee's service is up to snuff. That's how pro companies should respond to customers. MOTU has great interfacing solutions, no one expects them to have the best conversion in the world.
I have, on one recent project, preferred the sound of the a/d in my 1296 to the DAC-1, HEDD, RADAR and L2 that are here. Weird, but it worked the best for the music at hand (feeding an external analog chain back to the HEDD), so that's what I used. Call me nuts, but the first time I hooked up the Isochrone to the 1296 almost everthing that bugged me about its sound went away. Striking. My wife was sitting next to me and SHE (musician but not engineer) asked me what I had changed.
-tom