Sorry this took so long, i just saw this subject. I have the pez fuerte which is the same as the OMER Millenium Comp, while the silent hunter is the same as the standard millenium. There is a noticeable difference in stiffness, I would definitely reccomend the stiffer if you dive beyond 40' with any frequency. They are very durable though I was able to crack mine by having an anchor fall on them...but a little duct tape and some old Holiday Inn key cards did the trick. They have have taken me to 120', but more importantly they held together on the trips back up, that patch has lasted all season. They are a good fin for diving to 60' or so and they hold up well around rocks, but I would like a nice pair of stiff fiberglass fins for the deeper grouper hunting. These lack the push for some of the deeper diving.
Hope this helps-
Matt