I two wheeltop 1x systems. One is their GeX to run on my road bike as a 1x setup.  used for 1800 miles.   the other is a OX 2.0 mountain rear derailleur, used for about 1000 miles.  Both worked perfectly without issues. I tried the race option but it drained the battery too fast without much gain. So I am using the regular setting.

What they impressed me the most are the cost and the battery life.  battery last a few hundred miles so I only charge them once every few months. Never got stranded. 

Another big selling point is that they can work with any cassettes 7 speeds to 14 speeds so it is a big plus for me cause I have many bike parts lying around. I just rigged up a "gravel bike" using an old mountain bike frame and 11 speed cassette to use with the OX 2.0. Neither Shimano nor SRAM could do this.