Quality: 9
The Presonus Firestudio seems to be a high quality audio interface. It sounds fine. The preamps sound exactly like I would expect from preamps included in an audio interface. They aren't really anything special, but they are not bad. Of all the problems I face making recordings at home, replacing the preamps in a Firestudio would be fairly low on my "to do" list.
Reliability: 9
The Presonus Firestudio has been very reliable for me. I've been more than happy with the way it has performed and can't recall any issues at all once I set it up properly.
Overall Rating: 9
I picked up my Presonus Firestudio several months ago after some problems with my Delta 1010s which I had used for nearly 7 years. I've found that the Presonus Firestudio to be a well put together product. I've been very happy with it and enjoy the modern features that the Delta 1010s did not employ. You can read all about that here:
Departing With M-Audio Delta 1010 Audio Interfaces | Home Recording Blog
I've been most impressed by the routing possibilities which have made it possible for me to easily setup multiple headphone mixes with separate volume controls headed out to my Mytek DA 96 converter for my studio monitors.
I like the idea that I have 26 inputs (by adding ADAT Lightpipe preamps and S/PDIF inputs) if I need them. The Firestudio could work great for recording live bands (as in live concerts) as well as recording live bands in the studio. If you don't have any need for up to 26 simulatenous inputs, I would recommend the Firestudio. I'd go with the one of the less expensive Firestudio Project models simply because there is no reason to pay extra for the ADAT Lightpipe inputs you won't use.