The Universal Audio Apollo is a beautiful machine. Aesthetically it's gorgeous. The front panel and the multi-colored meters makes it fun to look at. Also, it's built like a tank. I love the design and the feel of it. The console software is probably my favorite. It truly makes recording like the good old Analog days, but better. The console itself is very clean and neat. It's easy to use and the recallability is a great asset.
The sound is very good and almost on par with the Apogee Ensemble (in my opinion). The mic preamps are very clean and good also.
My only disappointments with this unit is I wish it had inserts and sends for the mic preamps so one could insert and external EQ or compressor.
If you're thinking about getting one of these, look at this machine as a UAD audio interface and not just a Universal Audio interface with included UAD processing. I say this because the console application only runs UAD plugins and currently the routing options are pretty limited. The main focus of this machine is UAD plugins. It's not a problem if you love these plugins, but it you don't you may want to consider how you could use it in your workflow, or maybe another unit.
What I think is the greatest asset is how it affects my workflow. It makes recording fun again. I don't have to futz with all the technical stuff with this box, It just works. The plugins work perfectly in console. The latency is extremely low in console and in your daw (mine is Logic).
A really great, slick studio tool which has sped up my work rate with mixes and sounds brilliant to boot. Also, I have made a demo review of the Apollo which is on YouTube: