My Canon 580EXII flash died a few weeks ago so after weighing up all the options purchased a Godox V860c. Aside from being less than half the cost of a Canon 600EX the big advantage is the lithium battery - I am totally sick of AA's and recharging them and never knowing how much was left!!
The box arrived and inside was the flash unit, battery, charger, soft cover, and the user manual. The battery charged fairly quickly, maybe an hour in total.
Here is the Godox side by side with a Canon 580EXII. Almost exactly same size & weight (incl or excl batteries).
I was very happy my stofen bounce from the 580EXII fitted nicely on the godox.
Once charged I did a few test shots - all seemed very normal and HSS was fine. My only concern was the time it took from switching on to being ready to fire - takes about 3 secs which is a long time at a wedding if you suddenly need to fire off a flash But once on it recycles just fine....or at least no slower than the 580EXII.
All the buttons are easy to use and it's a big display so easy to read. So good having a battery life indicator - there is a battery symbol with 3 bars so in theory should be able to change battery when it looks low.
The mount is a screw type - it's not as solid as the 580EXII mount but if you screw it firmly tight there's no wobble or anything.
The flash head is a bit stiff compared to the 580EXII and doesnt have a lock button - seems to stay in place just fine all the same.
I shot a wedding with it last weekend and it all went well. So....so far so good but I guess only time will tell if the lower price = poor components which might wear out / fail over time.