That's awesome to hear! Mine are all from ~18 months ago and there's some very minor issues - trim alignment or the threads being a bit iffy. I haven't tried one of the newer nibs, but I know from experience that Bock assumes there will be tuning and a lot of places expect you just want the compatiblity that the 250 housing brings so they don't really bother, which is pretty fair (just use the house nib if you want tuning).
Hopefully those issued are well and truly ironed out at this point! I may have to pick up one of the more recent batchs here sometime soon to add to the teetering heap play around with.
Any thoughts on v800 vs v200?