Today I had my first ever session with the mavis 500... we decided to give them a go because the feather durability wasn't very good and it's very annoying when they start curving... They're also expensive... After 2 hrs of play, the mavis still flies straight. Isn't too different from a "average" feather shuttle. The shuttle looks like it last another 2-4 hrs. Everyone was still smiling at the end of the session... Give them a try... honestly, if you're playing for social or semi-serious competition, these are very nice.