Hi! First, I'd like to say that I like Cura so far. It's good software, with a ton of options, and the interface is intuitive. However, there are a few bugs that I'd like to point out.
1. It fills empty spaces in my models. I have tried a few different ones, and spaces that have exterior walls forming holes get filled completely. I tried opening the same models in Splic3r, and it was not an issue. See screenshots for reference.
2. The layers preview only replays the last layer or two, there's not way to make it go all the way to the start.
3. Also, I noticed the interface is quite a bit slower since 4.4.0 came out. It's not a bug, but... I don't know if it was really that necessary. I have an i7-7700k with 32GB of ram, and I can imagine it would be very slow for people with slightly older hardware.
Again, saying that to help improve the software, not to nag, and I am thankful for the work that is being put in it.