I have these on my necklace and 7'. I have only been diving them for about 20 dives. I really like the necklace as the I think it won't bulge like my last ones have at the DS4 connection.
My jury is still out on the 7'. It seems a little "floaty" but maybe not. I am not sure that the 7' is greatly worth it to me, but time will tell. I mean, it also routs out of a DS4
I will only know it a while.
Chris