I tried this a year ago. Had some trouble first downloading this (afaik the project only provided sources, not binaries, so you had to trust some random guy's website to download the .exe), then it randomly crashed within 5 minutes every time I launched it, then I deleted it.
I switched because Google removed the ability to log in and sync settings, history, password, etc. (I realize that in this case I'm directly giving Google my data) but it was a super nice feature.
There's around 4.9k lines of python code and 15.9k lines of patches. That doesn't seem that hard to scrutinize. From a threat model point of view you should be more worried about supply chain attacks from all the third party programs/libraries you have installed on your computer.