I have heard of a couple of people using them and being happy with them. They're based on a standard industrial power supply module that a lot of people have used for refitting their original power bricks, so there's a decent bit of history there with them too.
Depending on the original PSU you have, it might also be possible to repair it or replace its innards with a similar module, but unless you're doing the work yourself, the cost involved might not be that much less than a brand new unit, so ultimately not really worth it.
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