I did the airtest on the (only?) one still going last year. Not bad at all but the man to ask is Mr Farley (often known in these parts, I think he may have evaluated the aircraft for HMGov't).
I thought that the aircraft was classically British - Good control harmony - 'standard' spinning characteristics and woefully overbuilt in places and terribly thought out in others. I feel that its lack of success was down to it not being a giant leap on from the Bulldog (the slot that it was touted to fill).
All airframes and jigs are in the Aces High hangar at NW along with lumps of Opticas. Poor old british aviation - so near and yet so horribly underfunded/developed.