I still own a 1st generation Scarlett 18i20 and my experience is great with this interface.
Latency is very good, preamps are great, lots of in/out, great drivers, etc.
I now have a clarett 8pre usb and it is even better but I use my 18i20 for live gigs with excellent results.
Good Luck   

I realize I'm a bit late to the game, but I've had good luck with my Scarlett 18i20.  At first I was skeptical because I was having some nasty latency issues, but found out it was a problem with my CMOS, not the interface.  Since then it's been running like a champ.  The latency isn't quite as low as my old Roland VS-700R but still very good.  I found the driver interface a little confusing at first, but it's actually fairly powerful.  It's a capable, full-featured unit.  I don't think you can go terribly wrong with it.