I've placed four orders over the last several months and Z has definitely "over" delivered ... everything from the Z line has been top notch in quality.
I have enough trust in his business - my first order in the Euro line was for a bulk order of the - 5 10ml test cyp - along with some other stuff.
First hand - I can say the test cyp (international & US domestic) - D-bol 50mg - proviron and hcg are all great products ... All were the Z line - (not sure if the hcg is) but their all very good - I have more on hand but haven't tried them yet.
The only thing I've ever heard about a dose - was overdosed - Z let them keep it and sent out a new order which ended up being a very nice bonus anyway
With my proviron order - I ordered 100 and only received 40 - I told Z and he said sorry about that - keep the 40 and I'll send out 100 more - most people would have just sent out 60 more.
Ya gotta love getting 40 for free - I received the 100 before the 40 were half gone - so with service like that - Z gets my vote every time!