Long Fins in the Kelp

My poor argos booties take some serious punishment and they are still in one piece. I wear them from the truck to the water, over rocks in mud down cliffs, everywhere and they're still keeping my feet warm.  When I was washing my gear off the other day I stuck a hose in the boot and closed off the top to see if they had any leaks and they just blew up like a balloon.  That probably killed em but at least I know they're a solid product 

Milleniums, I don't really have any frame of reference since they're the first fin I've owned but my experiences have been mixed. I wear a size 9.5 with a 4 mil sock and bought the 42/44's, they seemd a bit wide and the one time I wore them without finkeepers they were too loose,(fit fine with the keeper on though).  I also immediately lost one of the fasteners, not sure how, and the rubber at the end of the rail is getting a bit worn and comes off the track easily.  My calves do not cramp but I've noticed that at the end of the day my knees are getting  fatigued. Overall they're not horrible but I might get something different when I wear these ones out just to try something new.