Eccentric Eno?......Sideways Cycles and Charliethebikemonger (I think)...or import from USA?
Very good hub but obviously all the eccentric stuff adds weight.
I had one, did what it said no problem. It does change your geometry slightly though, depending on how far you have to swing it round to take up the slack.
I do not notice geometry problems, when you tension the chain you adjust the brakes but its not a problem until you retension the chain, does not weigh significantly more or less than a converted freehub, looks much better than a tensioner.
They're fecking lovely! If you're okay with non-disc bikes ( you're a Retrobiker! ) then say goodbye to EBBs, chain tensioners and brazing on track dropouts. Every steel retro pimp ride becomes a singlespeed. Even my huge 18st @rse couldn't muck it up. Bliss...