I don't know what B&M you're going to, but I've been to a few hundred in my work travels, and only a few of them were pushing junk. Those shops tend to not last long, either.
There's only 1 company known to have issues with their regulated stuff, and they've been pretty much eaten alive in the process. The rest are all doing very well.
You brought up the Blu kit earlier. If I get time this weekend, I'll show you what that battery does if it hard shorts. Since it's essentially not regulated, it can, and all it takes is a bad cart build. But, you don't hear about them because they don't sell many, and it's BT. I've seen them fail.
Hint, your hand will not be well when it does.
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