I received a ThermTec HuntPro 650 just before Christmas, I have zeroed-in and now using it regularly. It's early days admittedly but thoughts so far;
1.) It was easy to zero - I am a bit of a technophobe and I found it easy - just use the X and Y adjustments as you would elevation and windage.
2.) The unit is very compact and light - in reality I don't notice it at all regrading overall weight and handling
3.) The image quality is good - on par with and, in certain conditions better than, my ATN 635 monocular
4.) Battery life seems very good, I haven't gone below 50% on a stalking session
5.) It has already added two deer to my tally that neither glass nor digital would have enabled.