Been shooting Bi-Delta Vanes for just over 10 years and have not regretted one minute of it. They are rather odd looking, look like I took a 2 inch vane and cut 2 notches out. They are low profile, low drag and silent. I get many questions about them at IBO shoots and everywhere else I go. I do not own another vane in my place. I use 2 inch for hunting with expandable heads and my brother uses the 4 inch with fixed.