Feature:
The DI is great, so are the monitoring options and adjustable input impedance. But it has only one channel (I drool over the possibility to use two of these things and track a good acoustic guitar in stereo). And it's only a preamp, what with all the channel strips out there to be had for a pittance.

Quality:
So it's manufactured in China, it's still top quality.

Value:
I paid 500 € for this thing. The only alternative, price-wise, would have been the GAP Pre-73 (250 €), which is great but seems to have been sold out everywhere.

Desirability:
ISA One looks a lot like the device us Finns use for picking lingonberries in the woods. How's that for "sex appeal"?

Sound:
ISA One sounds very clear and transparent. If you're looking for "warm" sound for vocals, this is not your preamp. But the clarity provided by ISA One was for me an eye-opener. Now my vocals sit in the mix so much better than with some tube pre's I've tried.

Ease of Use:
It's quite versatile, but the basic functions are straightforward enough.

Support:
I took advantage of the "Forte4Free" offer and contacted Focusrite's offices in Germany. Very friendly and helpful people. Focusrite's website could use some redesigning, though.

Overall:
Now I'm able to track like a pro (gear-wise, that is). If I want a certain sound, I'll choose the right mic for the job. I don't dial more "Tube Warmth" from the cheap but feature-laden mic pre of yore.