Yes, "ű" is quite common in the handwriting. Especially elder people uses that style more. But never seen "ū". It is Latvian letter, not Estonian as far as I know.
Estonian letters have the dots above letters - ä, ö, ü. Only exception is õ (not dash but wavy). Latvian letters are mostly with dashes above. So, for the Estonians are not natural write the dashes above the letters.