I had a problem recently with my OM 4 Way. The internal magnet wore through its plastic cover and bore a hole in the lid of the unit causing it to leak onto the floor for a few days. Once I discovered this I emailed OM in a panic and they promptly shipped me some replacement parts one week later for a nominal fee. It took over two weeks from the initial discovery until I was able to fix the unit. Moral of the story: keep an inventory of spare parts for everything.
Apart from that minor headache things have been doing relatively well.
I moved a few pieces around recently but for the most part I'm just letting things grow.