I've got a 4-16x44 amx compact that I've had for a few months now. Other than a single outing to a range it's all been back garden stuff from 12 - 30m so can't really give a decent opinion on what it would be like in the field or over a HFT course. I find it is quite fussy on head position. I have to be getting myself in the right place everytime, or very close to it, or I dont get the correct sight picture. As far as I'm concerned that's a benefit though rather than a hindrance because its encouraging me to be consistent with my head position. Solid construction and all the adjusters are firm but nice and smooth.
This is my first decent quality scope so I've got nothing to measure it against tho. Sure there'll be others along who've got more experience and knowledge.
Be good. And if you can't be good, be good at being bad.