I'll start with the great support from Vevor! They've been very responsive, helpful, and sent me an upgraded part quickly for free!
The diesel heater is great, I use it for our outdoor smoking tent (6x6 ice fishing tent...) in the Chicago winter, keeping the heater outside, and have the 3" hose go into the tent. At setting 2 (out of 10) it keeps the tent warm enough to keep an open window (15 degrees F/ -9 C outside). One annoyance is the clicking noise from the diesel pump which is not really loud but enough to be annoying... Hoping to fix/improve with some sound insulation. As expected, exhaust gets VERY hot, and emits some smoke/smell, especially in the few seconds after turning the heater off.