i used lowepro the first link, the strap is very nice keep the camera in position and comfortable for my neck, the memory card storage is nice but i usually remove them because it make the strap bulky.
It use a small ring to connect, and one of them has been broken
The other strap i use is optech strap, the nice thing it is flexible, but lil bit big in my opinion.
Both have + and - but both are a lot more comfortable.
there is the other option that i just discover which is R-Strp from
they have innovative strap that quite expensive.