I bought this a week ago and have had it up and running. Power out is instantaneous. My reason for this one is so I can be in a campsite with others and put it on propane and have a quieter running engine. We also are very happy to have it to add to our 72 hour plus survival kit. It won't run our whole home but will provide us with immediate essentials.
I just got it yesterday. I put it together, very easy to do. It started right up on gas and propane. I ran it 4 hours on gas it is so smoothe. I also have a wgen7500df. It is two years old and is also great