I've been using an EGO for the last few years and I absolutely love it! It starts instantly and reliably....no more struggling with yanking a pull cord on a recalcitrant engine! Quiet! No more blue smoke everywhere! Less fire danger from hot muffler! It can do anything that I could do with my small Stihl, with a lot less hassle. I've sucessfully dealt with two-foot thick logs with it (by cutting in, and then splitting off some sections, and then cutting further, etc.)
That said, I've always lived in the South or California when I've burned wood, so the quantity I need in a year is moderate, and I've always been able to get it nearby....no long hauling trips. The EGO will run for 20 or 30 minutes of pretty steady cutting on a battery, and then it needs to recharge for about that long or a bit longer. On the farm this works very well because I can move the wood around, etc. while the battery is charging. If I had a second battery I could cut more or less continuously. But I couldn't drive out at a distance and cut more than the battery's worth. With my small car, that's about good, too. If I had a pickup truck, I'd probably need 3 or more batteries to fill it.
The only other drawback I can think of is the relatively narrow and flimsy bar and chain. I end up replacing both on a yearly basis.