I've not but a few of my friends have. The roundhouse itself is impressive in it's construction let alone all the railroad goodness around and in it. I have seen a good part of the collection prior to the building of the roundhouse. When MR. Jacobson still owned the Ohio Central you could go out to Coshocton to the home office, sign a waiver, then wander out to Morgan Run(where the W&LE crossed the PRR Pittsburgh to St Louis main) where the OC's shop is and have a look around. Just stay off of the equipment and out of the shop building was all they asked. Those were good days.