I bought my FF Pros in the Keys back in 2000...they were on "clearance" in one of the dive shops. Paid $99.00 bucks for em. After the initial dives, I got used to the somewhat strange feel, as I was used to diving "paddle" style fins. These now well worn Pros are the only fins I've used for the last 10 years. They are scratched and scraped and look kinda beat up, but they still snap like when they were new! I think I will probably use this same pair forever unless they are lost or stolen. Bob makes an extremely high quality product, and I would replace them with the same model without a second thought. Scientific? No. Objective? Not really. Just the opinion of an avid diver and long time FF user.