I used to ride with High Rollers and / or Minions, then tried some nice big Nobby Nicks – they looked good, light and well made.
One ride on the Cwn Carn XC course had me slightly scared, one ride in the Chilterns was sketcy and I went trail surfing in the FoD.
So I sold them.
Basically they did feel lighter, but the nobs are not ramped, so I didnt feel they were faster. Also the nobs are small and fold over when you really push the bike into corners – which is what I do when faced with a berm/corner.
If you are say a ligher XC whippet I think they will work well. If your heavy and push the bike into turns, then I think you will be disappointed.