As far as Quality its a solid aluminium block milled out for the body top part is too with 2 holes drilled out one for 510 other for fire switch. Then a copper strip as a spring for firing , its as solid as you can get TBH
Price is too good not to get one ,
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Fasttech has a parts back new switch new BF pin, seals , and and copper spring / strip , for 2+ USD, i picked up a couple for spares but never needed any yet had it for over 6mths , like i say there is a thread running into hundreds of pages about it ,
Its a great compact size , would love a dual battery version if they ever made one. It would Allow larger builds , but do get good results.