My two cents,...I think it's more 'difficulty shooting' than the cheaper out sourcing from the Far East. They are a 'step up' challenging rifle to shoot if you want power and distance afield. but like RF stated,...if you stick with them,...you'll love them,..or in my case,...be well rewarded for the fruits of your labor. I've never owned a real Diana 350, but others that have shot my B-28's always say "shoots like a 350 to me". The nicer stock and slightly closer component tolerances would just be an added plus. The JM spring is a smooth shooting mechanism, but the OEM springs give raw power,...and more kick to boot. Call it a 50/50,..... I doubt I'll ever part with my B's though,...I'll just save up for another "BB-Gun"!!! tjk