Been using Wavebox for a few months and have fallen in love with it from day one! As someone who often finds myself jumping from project to project, its folders are a great way to keep those apps/websites for a project altogether. The cookie profiles are excellent as many of the same apps are within each folder, so changing one doesn't change the other. The UI is also very customizable, so you can set up whatever works best for you.
I do, however, wish that it would sync settings and apps between computers. Also, the notification badge very often doesn't work for apps like Discord. A few other small things here and there make me notice I am using a startup browser, but they usually are easy to overcome. The one time an update did break video playback and I did have to reach out to support, but luckily they resolve the issue within only a few hours.
Overall there are areas to improve, but I am still a delighted customer and tell others about Wavebox all the time. Thank you, Wavebox, for building a fantastic product that helps me get things done!