Coolest German Monster Tank?

[richvalle]

My choice has the distiction of having been deployed. I don't think any were knocked-out either.

Depends on what you mean by knocked out.  Also 'deployed'. Sounds like 5 were made, 3 were sent into combat and only 1 made it into combat. 

Per Wikipedia:
The one assigned to Kampfgruppe Fischer was immobilized with mechanical problems on its way to Lillehammer, while one of the two assigned to Kampfgruppe Pellengahr also had mechanical problems just north of Lillehammer. Only one tank actually made it to the front; it was immediately put in action with the German force advancing up the Gudbrand Valley with other elements of Panzer Abteilung z.b.V. 40.[2]

The Neubaufahrzeuge first saw combat against British and Norwegian positions on April 22, near the small town of Balberg at the far south end of the Gudbrand Valley. The British Expeditionary Force was equipped with 0.55 inch calibre Boys Anti-tank rifles that easily penetrated the Neubaufahrzeug. After dozens of hits, including one that killed a crew member, the tank retreated and the crew was hesitant to advance further.