There are different batches out there.

The only customer complaint about the wristech.net batch was that it was not watch sized.

There have been complaints about others selling practices and accuracy mainly of retail bought ones.

Wristech.net would refund for any faulty ones bought only from their independent website (receipt emailed from storeshop.com and not retail or tv or spam bought ones!)

There are moral and ethical issues which are strongly recognised.