I have the Godox tt685, which is very similar to the flash you are considering. I believe the main difference is the li-on battery of the 860 vs 4 AA batteries used in the 685.
I use mine almost exclusively for macro work using an AK diffuser. I have been very happy with it's performance. The only down side for me was the learning curve. Once I got used to navigating the different controls, I had no issues with that. I would happily recommend it. I preferred the 685 over the 860 due to being able to have an inexpensive backup set of batteries in the field, and inexpensive replacements down the road when the batteries reached the end of their lifespan. FYI, I use NiMH batteries in my 685. The 860 has a quicker recycle time, but that's not an important feature for me. YMMV
As a side note, I used a home made diffuser of similar design to the AK for several months and got very good results. I spent the money on the AK to get into something more durable than the cardboard/duct tape and t-shirt material of the home made unit. Results were slightly better for the AK.
Here's a couple shots using the 685 and diffuser.
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