Well a quick update on this - don't like it and can't get on with it at all.
I do very little trad so some could be down to poor technique. I'll often soap a window up and run a microfibre down one edge then work from that dry edge. The problem is the microfibre wipe then remains as a whiteish streak even after the blade has passed over it. Any small trails always smear - seems to work ok on the very first window then that's your lot. Maybe it's the alcohol in it evaporating off too quick or it's just me. I don't know but either way it's going in the bin.
Did a quick search on here under 'Unger liquid' and nobody seems to get on with it which I find suprising considering it's such a large company. Surely they test their own products?