Loved the two TMCC NH versions that I owned - will probably pick one up (again) in the near future. Mine ran great despite being equipped with K-line cruise. The detail was great - nicely detailer pantographs too.
In my mind the only downside was the blue-white LED. Others have mentioned the pickup shoes - these can be removed with a small screwdriver if they hit your switches.
In terms of zinc rot, some of these are impacted. Zinc rot or not, the pilots are a delicate point. If you look closely at online listings, you'll start spotting some where one or both pilots are broken.
Here’s an old video of mine on a layout. It had really smooth startups under TMCC control.
