Honestly, I dont hunt from trees. I prefer to be more active, I do have a poor success rate though...
John, you could quite easily be choked by the collar of you jacket. For there not to pressure on your neck, you must fall straight down. You can not guarantee that will happen. That is unless your attachment point is outside the collar...
If you would like, give it a try with something like a tee shirt, that will easily tear away,
may be painful though. Nothing builds confidence in equipment like actually using it.
I do know heights, Ive been a safety instructor/supervisor for over 10 years. I hold many certs. in the subject and am a guide, instructor and trainer. Plus a 25 year traditional archer...
My safety setup would consist of legit climbing gear (or construction equipmen,t same safety certs and manufacturers) It allows for excellent mobility, redundancy and ease of use under extreme stress or unreal environmental conditions.
Hands on instruction is required however.
Hunters products can be used out of the box whether they are safe or not...
I do not trust the average hunting manufacturer to understand fall dynamics and forces. If they did, they would be certified by an international regulator. (UIAA being the standard for both recreation and industry)
Its like buying a rifle without the caliber stamped on it, you dont know what your getting and wont till you drop the hammer.
Ive posted numerous times through the years about the subject... Never to open ears.
Just be safe guys, check in to your equipments standards (UIAA) and make sure you have some sort of redundancy.