I used it to map a system my players will be headed to soon, and it worked very well. It will definitely allow me to show the system's astrography, which will really enhance the experience a lot in the exploratory campaign I am running.
While it is fully usable as is for my purposes, there are a some things I will mention as feedback, in case you want to fiddle with it. These might be things I just didn't figure out how to do, i.e. user incompetence, but I'll list them all anyways. It's not to imply that you have to do anything more with it: it is a great tool and I will totally be using it a lot, and I really appreciate the work that went into it.
1. The default planet icons are not all that visible against the background; maybe something could be done to make them more visible? Could put toytown on but that's not really my thing.
2. I can't make the Density slider work. It says it is calculated, so this may be intended, but I got the impression from the video it should work. Maybe I just need to keep clicking on it more? It makes sense that must interact with Mass and Radius mathmatically, but a slider implies it can be moved directly.
3. On the ships designer, it is not clear how to change the engines to get the right thrust capability. Traveller ships use M-Drives, and we don't re-calculate thrust when fuel is used, which is not realistic, but oh well. The amount of fuel the ships use is tiny anyways - though they have big fuel tanks for the jump drives. Same also for cargo space: an empty cargo hold should make your ship faster but it doesn't. So you get a fixed M-drive G rating regardless of the actual weight of the ship. Also, the artificial gravity is not from spin but from "grav plates" meaning you can go at 6Gs forever with no adverse consequences since the internal gravity is magically controlled.
I see it is possible to add engines, but the questions it asks about the engine don't seem to allow easy replication of an M-Drive's characteristics.
4. From many of the screens, the zoom in button is not visible. It is always useful to have a zoom and unzoom (instead of just moving your head closer to the object).
5. Clicking "Tidal Lock" should, I suppose, make the day equal to the year (or you could say, it makes the "day" concept irrelevant). But it doesn't do that.
6. Different screens show different images of the planets: changing the image in one doesn't seem to be reflected throughout.
7. The radiogenic heating slider seems not to work.
Just some things I ran into, keeping in mind they might be just due to me not figuring out how to work the program yet.
