After starting this thread as I was shopping for converters, and being attracted to some very good deals, I wound up getting a Prism Lyra2, and a Burl B2 ADC.
Listening with the Prism DA is definitely a much more immersive experience than listening on the Apogee Symphony I/O I've used for years. I'll probably use the Burl for the most part on material that I mix. It is not at all transparent, but does add a really pleasing thickness to material, and softens the highs, to my ears.
Routing with this setup is a little complicated. I manually re-patch if I want to use the Burl. The Lyra2 is nice in that it has two DA's and one AD. Unfortunately, there is only one stereo AES input. I would love it if there was an AES input for each DA. I'm using the AES card on my Apogee to go between the computer and Lyra. The path I have been using is DAW>AES to DA1>Analog Chain>AD>DAW track, record armed and on input monitoring>Apogee ADAT/SMUX>DA2>Monitors. Maybe there's a better way... This allows me to monitor my capture, but I have to use ADAT/SMUX to talk to the second DA, which I'm not happy about. I've read that Toslink cables are more prone to jitter than AES.
I can avoid a lot of this by using the Lyra2 as the sole interface via USB. Right now I'm using it like this because I've been doing a lot of mxing, and keeping the Apogee in the loop allows me to use it's 16 channel analog section for hardware inserts on individual tracks in a mix.
I recently got an older Z-Sys 8.8 Detangler which I hope will streamline a few things once I get it installed.
I'm figuring this out as I go (digital signal routing)... please advise if I've completely put the cart before the horse! Eventually I want to arrive at an efficient workflow for mastering only, which easily allows me to listen to the processed master, the unprocessed source (level matched), and to audition the Prism or Burl ADC on the processed master. I have a very clean DIY passive monitor controller with four analog inputs, but no digital section.
Did I mention that I'm in Alaska? There's no one to talk to about this out here on the frontier... This forum has been very useful.