Packed with features, takes a little bit of use to get your head around the rotary controls and assigning various features and settings via them, but after a week I was whizzing around it. Monitoring via the actual device is really great and totally latency free. The ability to have several monitoring mixes assigned via the one box is also very useful.
Great sound quality, totally reliable, really flexible, built like a tank and worth the greater expense in comparison to other interfaces I've used. The accuracy and tweakability of the trim, playback, master volume etc is really really useful - fine tune to your hearts content.
I keep finding useful applications for the flexibility the audio express affords. For a project home studio set up, it is totally worth the outlay. You won't look back.