Yes they are reliable, at least for me having had a few for years and years now.
But.
1) As they say. The past does not indicate the future, I have no idea how the quality of their miners now.
2) Any maker can have a bad batch.

The other issue is unless you have cheap / free power you will not ROI for a long time. Too slow and not efficient enough. If you are using them as space heaters or similar then go for it. But don't think you are going to get rich. Unless you get lucky and whatever coin you are mining skyrockets in price.


-Dave