I've been an avid and very happy user of Coravin. I just realized though that some bottles (especially 15+ yrs old ones) seem to leak a tiny bit of wine (I can't figure out how to attach pictures, as soon as I figure it out I'll update this thread).
I re-sampled the bottle and it doesn't seem oxidized or markedly different. Also the bottle definitely had argon pressure inside it when I pierced so it seems like the cork provided an adequate seal.
So how did the wine get out?
Anyone have similar experiences? I already ordered the finer needle, hopefully that'll fix the problem.