I bought a loaded Horus -- 4 cards, 16 channels in, 24 out. Half are high resolution cards (8 channels DSD in and out). Firstly, I'll say that the conversion is outstanding. Deserves a rating of 5+. Stunningly good.
And for the price, expensive as it is, is a relative bargain when you compare it to top-shelf converters from other manufacturers. Read more
I considered a similarly capable Burl Audio / Dante system, and the Horus was many $thousands cheaper.
Where I have been challenged is environmental. I was looking for a network capable solution, which really comes down to Ravenna or Dante as underlying protocols. This is more than a philosophical choice. While the two camps will claim compatibility through AES67, the most obvious price is 48k limit to the sample rate. The less obvious price is I can't get it to work. So you really need to understand that relative attributes of Ravenna OR Dante.
Additionally, I run a Native system, ie off-the-shelf DAW/computer rather than the Multicore/Pyramix solution offered/promoted by Merging. The Multicore system is built and optimized to run the Merging solution. Running Native, you need to be TOTALLY committed to optimizing the system to run Merging over the network; e.g. shut of all other network traffic, shut down firewalls and anti-virus, don't do ANYTHING ELSE on the computer while recording, otherwise you get glitches. It is a demanding mistress. And not for the faint of heart. It is a very technical solution.
But, once you 100% commit and adhere to this discipline, you will get unbelievable recordings. For me, a fair price to pay.