Firstly - I should state I seem to be one of the rare people who suffer bad eye-sting from near eye devices - and was hoping more modern viewing displays had improved that aspect but it doesn't sort the issue for me.
Secondly I'm not happy it ideally suits 100 yard ranges - and firmly feel its best left for those shooting subsonic rifles. I shall continue using my E700 based heads up rig despite it being substantially bulkier than modern Chinese rigs.
It has two 45mm scope adaptors and three different length eye cups with it. Not much more I can say about it really except there are umpteen reviews with videos on youtube all by people using air rifles, expressing its immense capability.



Also posted for sale elsewhere.