I haven't yet had a chance to use the adapters abroad, as I just received them ... however, I did order 2 of them and was able to convert from my local Canadian power to European format with one adaptor and then back to Canadian format with another - so at the very least, it would appear they work. The design is simple enough, and although the spring loaded prongs might seem problematic to some people at first, it's really not that hard to push them back in to lock into place when you don't want them. I actually like that the springs and locks keep the prongs that are in use firmly placed while hiding all others. I can't speak on the longevity, but they feel sturdy. I look forward to many years of use.

Works as expected. Seems like it's made well.

Haven't used yet but seems as described.

Works ok for the price but it is quite heavy for some outlets

works as advertised

I like the form factor and how it functions. Great price.