Generally decent quality, with what appears to be a good quick release clasp (at least it appears solid enough initially). Colours for black, red and white are all pretty good, with a solid and flat colour.
The strap material seems robust, but the main criticism would be that the straps aren't as flexible as the official ones, which makes the watch feel bulkier on the wrist - don't know yet if it affects the quality of the HR pickup during exercise, but seems OK for daytime usage. Two bands for securing the strap are welcome, as a split on on the original strap (after 3 years) was the reason for getting replacements.
Note - my straps came with the screwdrivers needed for removing the strap pin. It would have been good to know (it's not in the description at time of writing) as I bought a pair of screwdrivers independently and since I bought 3 straps, I now have 8 of them!
