I switch between XXl Jets and Turtles, as others have said the fin is just a bit (not much) less "snappy" in it's reaction however the better foot pocket design is well worth it - the foot pocket is more foot conforming than the Jets where SP uses a "box" hoping people have square shaped feet I guess
If you can't find them on Ebay check with leisurepro http://www.leisurepro.com/Prod/BLRFTF.html?Search=op%3ddtSearch%26Term%3dturtle%26SearchFlag%3dall%26AdvSrchSortField%3dRelevance%26SortDesc%3d0%26Hit%3d1
Aloha, Tim
If you can't find them on Ebay check with leisurepro http://www.leisurepro.com/Prod/BLRFTF.html?Search=op%3ddtSearch%26Term%3dturtle%26SearchFlag%3dall%26AdvSrchSortField%3dRelevance%26SortDesc%3d0%26Hit%3d1
Aloha, Tim