Scarlet 6i6 Johhny's top pick!

I have had a smaller interface on my wish list for a while. My Tascam has worked perfectly fine but I'm well aware of the latency which rules out using it live. It's also a bit bulky for laptop stuff. 
 
Probably been reading every article, review and thread about interfaces for over 4 years now. So my choice was based on my criteria of:
#1- Connectivity
#2- Drivers are trusted by all
#3- Pre amps are also trustworthy
#4- Must be AC powered
#5- Must not be cheap plastic box
#6- Priced under $450 ( I paid $235can) 
 
The MixControl software is at first hard to figure out as they have used a naming system that's a bit confusing. But once you get your head around it it is very powerful. It is possible to run four different cue mixes as example. You can also assign any track from your DAW and then use the mix control mixer to balance the sound without trashing your projects mix.   
Some free software too, Bass station looks cool. 
 
Software/ drivers had some sort of conflict on the first computer I was testing it on. Turned out they posted the old drivers on the support site, I still can'r figure that one out and how I managed to get the correct driver is lost to me in the confusion of trouble shooting. But once I got my hands on the correct drivers all is working perfectly. 
 
So this unit is priced the same as a Quad Capture, my other consideration. But there is a lot more here for the same money. 6 in and out instead of just 4. And two headphone controls and a separate monitor volume control. 

I've had great luck and satisfaction with Focusrite.

It's a very good little unit. I'm very pleased with mine and it does allow pretty low latency. That said, it does not play well with Notion, which will crash almost immediately when you route audio to the 6i6, and since Notion works fine with ASIO4ALL to the same device, I'm suspicious that the Scarlett drivers are implicated. Otherwise it is pretty rock solid with Reaper. I can't speak for Sonar having divorced a few years ago.

Thanks for the review and the info.
 
I am considering an upgrade to the Quad Capture because of compatability, reputation and budget.  The two headphone outputs on the 6i6 might tip the scale though, as I'm planning to record other singers and need a way to monitor.
 
(Turning the volume knob on my Fast Track Pro causes 'pops' on one of the outputs and it's getting worse.)