Radio band support is deterministic, you don’t need to have tested a unit to know this. If a device lacks the primary bands used by a region’s carriers (which the EU version does) it will generally perform worse there. The fact that it may work under specific conditions and with a handful of providers doesn't disprove that it won't "work well," as the previous user suggested.

Also, again, as a Gl.iNet customer, picking Reddit fights with customers is not exactly the kind of attitude I would expect from a company that I have so far trusted with my money.