My impressions after my first real usage of my Scarlett?
Well, I must say I was impressed how stable my new rig was. I plugged MIDI, and two guitars into Scarlett and Line out to the PA.
We were jamming for 3 hours and did not have a single drop out or any other audio engine problem. I recorded everything, so Sonar was constantly recording two guitars, one VSTi (MIDI) and playing back VSTi drums (Superior Drummer).
Running MSI GE620 notebook (i7 2,0 GHz), X1b 64bit, with 8 GB RAM, I had around Scarlett ASIO buffer set to 3 msec (around 10 msec roundtrip latency) which is I think great.
If you want some additional info on how Scarlett performed, let me know. Generally, I must say, I am very pleased with it.