I looked at several brands of tow behind leaf blowers and choose this one for price and all metal construction. At time of purchase, there were no reviews of this leaf blower. The website offers no access to engine and assembly documents to review prior to purchase. I bought it anyway. There is a shipping cost. The crate was delivered by semi. The driver unloaded it to ground level on a lift gate. I used a hand truck and strap to move the crate to my garage. There are two paper documents that cover the engine and assembly. During assembly, I did remove the impeller to put anti-seize on the PTO shaft and shaft key to facilitate future service, if needed. The internal threads of the crankshaft/PTO securing the impeller may have been cross threaded on initial assembly, and would not clean up satisfactorily with a tap. All that bolt does is hold the impeller on the shaft. The shaft key ensures the impeller won't spin on the PTO shaft. Three bolts secure the impeller to a collar at the face of the PTO shaft. Otherwise, assembly is as described in the manual. The engine manual details oil volume (0.9L) and viscosity (10w-30). I used 30w. There is a 12v battery and a pull cord for starting the engine. The engine started easily and has run well. I have about 14 hours use to the time of this writing. Here is the fun part: Even at half throttle, the blower moves leaves thoroughly (could lift new sod) and is very satisfying! There is an adjustable shutter at the outlet. I put anti-seize on those threads also. I would say get it and enjoy less work!