TL;DR - Don't fit non-Quickfit straps/bands!
I'm not having much luck with my Descent G1 - first one had to be returned as there was what looked like a moulding defect in the bezel, though Garmin were very good about quickly replacing it.
So then, I thought about replacing the supplied strap with the non-Quickfit strap from my Instinct, as the contoured design of the Instinct strap makes the watch look better on narrower wrists, rather than just 'dropping-down' the sides of the wrist like the Quickfit ones do. So I removed the Quickfit strap, took out the pins, inserted them into the Index strap and fitted them back to the watch. Unfortunately, although the strap fits, when wearing it you end up with a terrible-looking gap between the strap and the watch as the different shape of the watch doesn't hold the strap flush against it.
Oh well, back to the Quickfit I thought. But no! Once you fit a rigid non-Quickfit strap, it's absolutely impossible to remove it! Unlike the Instincts when you can insert a pin from the outside of the lugs to release the strap pins, there are no such holes on the Descent. Unless you can squeeze the strap narrow enough to be able to compress the pins from the inside of the lugs, the only option is to cut the strap off.
Even when I accepted I'd need to destroy my Instinct strap to get it off the Descent, I didn't realise how difficult that was going to be, as the fastening point of the strap is reinforced with solid plastic inside, it's not just silicon.