My new prairie arrived this morning. I was impressed by how quiet and smooth it was straight out of the box! After running in and subsequent running with a rake of Collets, the lack of vertical play in the wheels hasn't presented any issues yet - fingers crossed! I did observe that, although it's weighty (enough for me, not so much for others apparently) and has great adhesion, it is not very powerful compared to some of my other models (although still plenty powerful enough for the needs of my layout).