That is what I mainly trying to find out, what might cause such a thing so that I can make sure to take proper precautions against it. If the power supply of this type is less reliable than others then I'd rather go with one that is more reliable.
Well then you had better not buy it as there is no way someone can give you a guarantee you are implying for, nor can anyone vouch for the accuracy of the comment you read. You could always put fixed resistor (or lamp?) loads on the PS and let it burn in for some time until you have confidence in it.
Actually, anyone who has experience with the unit in question could vouch for the accuracy of the comments I read by saying whether or not they have experienced similar problems.
And I didn't say anything about looking for a guarantee, I didn't even imply it. Once again, I don't know if you are just overlooking this or can't understand or what, I'm not interested in whether or not I should buy it, I've already got a similar / same unit from a purchase I've made previously at newegg. Not sure what your reference to lamp is, the only thing I know for lamp is the acronym linux apache mysql perl.
My original questions remain, Does anyone have experience with one to know what causes this? Is it the voltage regulators in the brick aren't very good and let to much voltage through, or are surges causing a problem or something like that? Someone doesn't necessarily have to have experience with this unit to say whether or not faulty / poor quality voltage regulators could cause damage to the circuit it is being used to power. Anyone familiar with how these types of units work could probably comment on what inside of them could be cheap and cause risk.
If it's something like voltage regulators, then the question becomes would an additional 7805 5v voltage regulator between the power and my main circuitry be enough to take care of any potential over voltage? What would happen if the unit sent 110 volts down to a 7805, would the 7805 fail and leak additional voltage into the circuit or would it just burn out but keep the circuit safe? Would adding fuses help?
An alternative would be a PICO PSU
Thanks for the suggestion, but looks like that is a DC-DC power supply. I would still need an AC-DC transformer on top of that and would prefer it to be all one unit. That Pico PSU looks like it's designed for Carputers and projects of that type.
I've got a couple of other old laptop power supply bricks laying around, but most of them are upwards of 19v 4A+, way more than I need. I might would use one of them with some regulators I'm just worried regulators of that size to knock that down to a usable 3.3v or 5v in my main circuitry would be putting out quite a bit of heat.