I sure do! One 1970 I had was superb, definitely worth it if you can find any. Then again, another 1970 I had was already starting to fall apart, so provenance really matters.
Of the more recent vintages, you can check out what I’ve had from this thread: https://www.wineberserkers.com/t/tn-lra-ardanza-904-vertical-1989-2010/
That 2015 really isn’t typical in any way for an Ardanza - unless they’ve changed their style noticeably in the 2010’s. Atypically sweet and soft. However, I’ve never seen any real hype surrounding Ardanza - it’s just a solid, old-school Rioja that used to be great value for the price (at approx. 20€). I’ve seen it sell at 40-50€ and at that price it really doesn’t make any sense, because you can have a good vintage of 904 at the same price.