Here are a few videos about it.
YouTube - Broadcast Yourself.
It seems efficient. The drawback I think are the following:
Weight of the unit. It seems heavy at around 13KG. Operator will get tired quickly. I haven;'t used it, but I home someone who actually used it could share his experience about the weight issue.
Operating time on full tank. I am not sure if 2 hours on full tank is actual and real time. I suspect it is less. I don't know the capacity of the tank. Also the price of gas is going UP. So that should be taken into consideration.
Overall, I think is is much more efficient and cheaper than manual harvesting.