I freaked out when the Hartzell showed up in my FWF kit without prior communication. All I heard was negative comments about the Hartzell. The good news is that was a different product. The governor than Van's sells is realitively new. It's a little smaller than the MT and I've not heard any negative comments. I'm also not flying yet, so I can't comment much further.
Hartzell is about 45 minutes away, so that is a plus for me. My governor arrived without instructions. Les from Hartzell offered to swing by the hangar after work to assist with the install. It wasn't necessary, but I certainly appreciate the offer. He also did a lot to alleviate my fears.
Since I really had no data to make a good decision, I errored in supporting the local US based company.
bob