It's a tad light on the features, but that may be a plus for those who don't want a cluttered calendar. I don't use the Week View or the Year View, so I don't know how well they work. The Month View, on the other hand, is what I use the most, and it's worked nearly flawlessly for me. There's also the synchronisation with other calendars. I don't take advantage of this feature, but it seems like a useful feature. My only gripe is that it seems to crashes unexpectedly on Linux Mint 19. Again, it could be simply an issue with my own setup, so your mileage may vary.