They work just fine. I haven't hade any durability problems. Just keep them out of trees or stands or walls. If you keep them in the "foam" you won't have any problems. Just be aware they don't like heat to remove the tips very much. So, make sure you know what tip weight you want before you glue them in. As far as the nock insert, I use Easton 2213 bushng for my CXL 250.