Thanks, @datacommando, that's really helpful. I have read a few forum posts and reviews effectively saying that if your interface isn't up to scratch, you'll get terrible results from Native, but no-one suggesting what a baseline might be.
I also didn't realise that the trial was there, so that's an awesome idea. I'll download over the weekend and see what happens; there's no better way than testing with the kit you are wanting to use. I was just not wanting to drop best part of £100 if I needed to get other things first!