Rohloff since 2008 or so. No idea how many miles that is 30k+ easily. Mostly commuting but a couple of longer tours too. It's started slipping a little, occasionally in one gear, now. Suspect it needed a few more oil changes than the one a year I've given it. Only other service is replacing the change cable, which I've done twice. It's a little fiddly, but not hard.
Very very easy to ride and robust ideal commuting.
Gear range is superb, spacing slightly wider than a dedicated racer, but no overlap. I do use all 14, and would feel very restricted with just 8.
I would recommend getting disc brakes though (I don't), as having to have the wheel rebuilt when the rim wears out is a pain, but otherwise no issues (apart from cost!)
I'm riding the Raven Sports Tour ~ 12kg with mudguards, rack etc. At the time the shifter didn't fit on drops, so I have short flat bars, with drop bar ends that works very well, and hard;y notice it isn't actually 'proper' drop bars.