Alot of it comes down to personal preference. I hunt/shoot with friends that use WB's with vanes, and none of us are bulls eye everytime shots. So the difference is grouping isn't really noticeable to us. However, we all drop deer the same. The biggest difference is that they are replacing their vanes regularly while I'm still using the feathers that were put on arrows origianlly. My target arrows "whisp" through the air, but still fly true. My hunting arrows still are dead silent...

They like their vanes and I like my feathers. If you like your vanes and don't mind having to replace em from time to time, stick with em... It's your rig, set it up how you like it best...