I just tried Tanqueray vodka for the first time yesterday. I liked their gin, and now I know the vodka is decent too. I didn't even know they made vodka before last night.
Best vodka I ever had though was last summer on a salmon processing barge up in Alaska. I was working with a bunch of Ukrainians who were over here on J1 student visas. I have no clue what the brand was, it was all in Russian. Went down like water, but packed a helluva punch.