Believe those are the same as S9 81mm bomb hills... I have 80a's on my demonseed speedboard and while I havent tried any other popular wheels (83mm Abec-11's, HAWGS, seismics) I can tell you that I love them. The ride is smooth and quiet, and very fast. In tight corners they grip with the slightest drift if you push moderatly... With a really quick hard corner you could get them to slip pretty easily but I havent pushed them to the max.
Not sure about technical sliding, for that I think harder is better but for
DH they are great and they will be pretty good for safety sliding and some basic slides... Although they are more of a
DH wheel.
Also the 81mm size is a great mediun between high acceleration 76mm wheels and high top speed 85mm wheels.
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