I'll pretty much agree with S2K abuot n-track being less efficient than the pro stuff, but I beg to differ on the crashes. It all really depends on your machine, I haven't had a problem with crashing, but of course I have a machine whose sole purpose is recording, so I have somewhat of an advantage, I dont have to have a whole bunch of other crap on my computer. And it DOES support custom routing for multiple output soundcards, I know I have one.
But I would say the very best thing abuot N-Track is the support, Flavio reads the message board regularly, but most of the time other users will help you out.
And as S2K poitns out, it will be up there with the big boys one day, it's getting better everyday. The latest version 2.07 (last time I checked) is really solid, I dont think you will be dissapointed if you buy it.
ametth