David - to return to your question...
I know the S Yorke S10 and it's excellent. It is easily superior to its smaller brethren which, IMO are very good indeed. Frankly it's one of the best TTs I've listened to.
I can't compare directly with the Spiral; I only listened to it once with its own arm, and it was next to a revamped Garrard (it looked a bit like it, too). It was the model were you insert the arm & twist to lock.
All I can say is, it sounded better than the Garrard with an SME arm.
Regards