I’ve had zero issues with my varia mount and the lil rubber band is pretty solid.
Can’t remember if the stock quarter turn comes with one, but I do have a few aero seatpost bikes and the Aero post rubber insert for the quarter turn mount works just fine.

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"When the going gets weird, the weird turn pro."
Hunter S. Thompson

There are some third party mounts that attach to the saddle rails (similar to GoPro mounts) that are probably more secure. https://www.amazon.com/..._apa_i_s887CbJMPYSV4

I've been using the rubber band one for a while and it's been fine, but will probably pick up one of these for switching between bikes since it's basically the same price as the Garmin mount.

I’ve had mine for 3+ years (might be 4 years now can’t remember as it may have been summer 2015 when it was bought) and never been an issue. Mine is on a round regular road seatpost so it’s not being constantly “stretched” but I’ve never had issues. I also think there are different sizes of rubber bands so while it seems worrisome, it’s been fine for me.

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Brooks Doughtie, M.S.
Exercise Physiology
-USAT Level II