You have to be realistic when talking about a cheapy.
I have got several JSR scopes, all mine have the Allen key adjustable turrets which are a pain in the rear!
Build quality is not great, dialing in is a bit of a joke but they tend to hold zero reasonably well. However, the glass punches much bigger than it's weight!
All in all, be aware of price/product, but I bought one, then another and another and one for my lad as well...taking everything into account I rate them as very good value for money!!
Cheers Deker, it will last me until Andy sells me his Hawke scope, he