I recently bought your 3 main apps for my Mac (to replace Photoshop, Illustrator, InDesign). So far they seem good value.
However, here is some feedback after trying a new project in Designer.
1) I'm not a graphics pro, and it's been a while since I did anything in Illustrator or Photoshop...still, when I tried to make a transparent gif (png also possible apparently), it was not at all intuitive. I couldn't find an answer by googling or youtubing and had to resort to asking in this forum. Someone quickly explained I had to first Rasterize the image before I could save it as a transparent gif. As I recall, the way to achieve this was much more obvious in Photoshop. I guess there may be a reason you do it this way, but it was frustrating.
2) Granted, I'm a beginning with Designer, but...I was trying to figure out how to make the background into a checkerboard (which is convenient when working with transparent images). I STILL haven't figured out where the command is for that. If it's in Preferences, it's not obvious where. I did eventually figure out how to at least change the color of an Artboard, so I could see the white image I was working on. Speaking of Artboards, it was very confusing to figure out the work area that shows in a new document is NOT an artboard (see attached). I spent quite a while trying to figure out how to select the default work area, when I finally figured out it is not an artboard.
Many basic things like this will undoubtedly become automatic if I continue to work with your apps. But as a 25-year Apple support tech, it seems these things could be made to work more intuitively.
IMHO,
DP
New document work area (below), looks just like an Artboard (below that).