My personal drag 350 ALKY bike has had the same v force 2s in it for 3 years. No problems. As a builder (and i have built several high rev motors) I have only seen maybe 1 or 2 problems out of hundreds of these reeds sold!! I have also seen Boysens crack and break too. They all have there downfalls , part of having a High performance setup/motor and not stock! As far as "high revving" motors , i personnally havent had any troubles with V force 2s !