Without sentimentality nor historical rationale, how would you order these (positive display versions) in terms of comfort, functionality, and legibility:
You can use the GW-5000 strap on the GW-M5610. It is very soft and flexible. I did this on one of my two GLX-5600-1 (as well as replacing the bezel with a matte black one).Only owning a GM-W5610 in the square department, i fully agree with Ryanjeepguy.
The module is simple and reliable, the watch itself is light and quite small, but the strap... Well, let's say it's not the best part of the deal.
I know there is a carbon fibre strap available (don't own it, not planning to get it for this watch), but it would already be a huge improvement if the softer resin from the pro-trek line was used.