What got me into 10x is actually how similar the default setup is to Visual Assist (including default shortcuts). And since it supports Visual Studio solutions, 10x will just work out of the box with any Unreal project or many other similar large C++ projects. You could even switch back and forth without a problem while evaluating 10x, which is what I did the first couple of months or so when I started using it. It has already come a long way since then though, and I've been using 10x exclusively for quite a few months now (full time working on an Unreal project and some personal side projects). The developer is a former game dev himself, so he understands our particular needs quite well and is very responsive to them. The fact that 10x can easily manage those kind of codebases is what really differentiates it from other "lightweight" text editors in my book. Building and debugging still goes through Visual Studio for VS projects (with good integration and no required setup), so switching causes no disruption.
Compared to Visual Assist it may not have all the bells and whistles yes, but especially the code navigation (which to me is the most important aspect) and code completion is quite advanced already and incredibly fast, even compared to Visual Assist. Parsing the entire UE4 codebase for the first time (in the background) takes a couple of minutes. Opening it from cache is practically instant, all search operations / code completion are also near instant with no stalls whatsoever. In terms of refactoring it is more limited, but renaming symbols works well and that covers about 99% of the cases were I regularly use refactoring tools anyway.
And unlike Visual Studio or JetBrains IDEs, 10x is so fast and lightweight that I would like to use it for all of my text editing needs. That makes customizing it much more satisfying as well, which is quite easy to do with a straightforward Python API.
As you can probably tell I really love this editor, it has had a quite dramatic impact on my enjoyment of work already. It won't be for everybody (and it doesn't try to), but I would encourage everybody to give it a try. If it is the kind of editor you are looking for, I think you will be very happy with it.