AC 110V/220V to DC 5V 2A 10W Switching Mode Power Supply Board AC-DC Power Adapter Module 5V2A

Works as advertised, very small footprint. No much more one can say. Don't have an O'Scope to check for AC ripple but it does power an Arduino without any issues.

Does fine, bought it 4 months ago. The other guy also has a raspberry pi, probably using a raspberry pi 3 or something, which does draw quite a bit more power. I wouldn't use more than 60% of any of these supplies rated amperage.

I bought this to power a Raspberry Pi for a project. It's been on 24h a day for 2 months and I discovered the other day that the Pi went offline. When I checked, I could see the power coming on and off every few seconds. When I tore it apart, I found the cover to one of the capacitors rolling around.

These are great little power supplies for embedded projects. The holes allow for use of standard pcb standoffs. The price is reasonable.