To me they seem not - there are several flaws in their methods and their stating of clearly identifiable 'Germanic'/'Celtic', ... genome types is very questionable...They seem to be credible.
Inquiring about your individual family history has nothing to do with individually constructing an supposedly 'ancient genetic heritage' probably ripe with 19th century ethnic stereotypes ('Look, I'm a typical descendant of mighty and ferocious, barbaric Celtic warriors, ...') - a service, which this site seems at least inclined to offer and which could foster exactly such 'ethnic pride' mentality/attitudes.What does this has to do with ethnic pride? You asking your grandfather of his grandfather is also ethnic pride?
Maybe I'm a bit harsh in my critique, but I'd rather see people interested in their family history resort to serious genealogical research services than to pay dearly for an quite meaningless genetic analysis, which has no really solid scientific footing (cf. the issues, problems and controversies of European population genetics in general) and no real relevance if it comes to categorization of ancestors into ancient 'ethnic groups'.
Human diversity isn't hard to accept - it's hard to accept if someone attempts to root mankind's immense ethno-cultural differences in it's genetic makeup...Also something else I've always said. Humans are one species, but funny thing, dogs are also of a single species. People are just different, which can be hard to accept for some.
Excuse my probably too confrontative and rather sharp statements, I'm far from criticizing you personally - it's really only an issue with the site you linked.
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