Well, did 80klm at Lakeside yesterday on the 235/45/17 KU36's.
Fisrt run I was concerned I'd made a bad decision as the were very slippery, but each subsequent run they got better.
Once I came to the decision to change driving style to suit the tyre it was actually fun.
As opposed to R comp tyres that (IMO) reward smooth and straight driving, the way to drive these was a fair bit looser, and really punish them.
Ended up with a best of 61.20 secs on what was a very hot and quite windy day and the track seemed a little "off" judging by other folk's times.
My best on O3G Dunlops in the same size is 58.63, but that was in kinder conditions.
All in all, I reckon they're superb value, they don't offer the feel of a race tyre but really hammering them made it fun! Not worrying about sliding them because they're so cheap is good too.
I messed around a bit with pressures, and found 45 hot was about on the money.
Everyone I've spoken to rates them much higher than the Federal 595RS. Seems the 595 has a very soft casing construction and even light cars squirm them around a lot. I've driven a GT4 with them on around Lakeside and would agree with that too.