They work great... havent heard any bad reports if done right...older ones were iffy in super cold weather..
the heat shrink with Quick spin vanes were chewing up Ugly Cookies...but they should have known that and switched to the blazers..
BTW any wavey vane can be straightened like new...clean with soap and fine steel wool....dry and than use a hair dryer to heat vane ...dont over heat but get it warm to the touch....it will look worse while heating them...let cool and they magically straighten out like new...
Neil