i don't think they're sold here, and i have no experience with them. but without you being specific, it's probably like asking whether phoenix gold is good or not: they have 3 levels of gear from entry-level up to premium, so depends what models you're referring to.
i suppose their relative price would be somewhat indicative. if they're on par in cost with other brands sold in the US then that's probably what they're quality is like. so if they're similar prices to PG xenon series, they're probably like those: very good.
generally, i don't recommend buying 'blind', but not sure whether you've used them or auditioned them before.