Only issues I had were that it ws difficult to tell when I had filled it with the proper amount of oil, and getting the battery cables connected together was very difficult because of the tight space, sharp edges of the case, and very short leads that it made it difficult for the very tight plug.
This iGen was purchased to pair with my first iGen to power a 5th wheel trailer while boondocking. With two iGens and the parallel wiring setup to supply 50amp power, we are golden. Easy to work with, easy to operate, easy on gas and easy on the ears. I believe this will suit our needs for many years to come.
Just received this iGen4500c (one of two) and I love this set up. Poured the oil in, added some gas and hooked up the battery. A flip of the switch, a press of the button and it started right up. It ran smooth as silk immediately. Plugged it all kinds of power tools to vary the load and it did not skip a beat. I ran it for a 30 minute period to begin the break in. I was very happy with how quiet this beast is. Speaks softly and puts out a lot of power. Next I will hook this one to it's brother that I also just received (two of two) with the parallel hook up and run my 5th wheel trailer, which is why I bought two. I have no doubt they will handle everything just like they should. Control panel gives a lot of info, some info you don't notice at first. The fuel gauge and power output percentage are nice LED level gauges on both sides of LED readout gauge. The only two complaints I have is that gas consumption on LED gauge is only in liters and not gallons and that there are some sharp edges around the area where the battery goes. Scratched up my arm well but I have "old man skin".