I have the Monster OTG device & I've had no issues using it in EU or Asia.

I like it because it has a short cord, so if the only available outlet is behind a desk, it will still work. I also like it because it only takes up one outlet, unlike that Accell unit you linked to. This will also fit well into a standard travel adapter (as would the GE that you linked to). Some of those larger ones would be pretty bulky on their own, and then when you add additional cables to them, the weight will pull them out of many outlets (I'd suspect that this would be an issue for the GE adapter too). It's also superior to the Belkin in that link because it'll work with 3 devices even if one or more of them have a wide power transformer.

I think the primary difference is that you want one that's really just a dumb splitter. The ones with integrated USB chargers would be the ones more likely to have problems with different voltages.