I used to be a big fan of Universe Sandbox and made a lot of publicity for the program. Many of my friends did buy it but i don´t feel good with it anymore.
One thing is the payment plans. I can´t afford 29$ and i won´t beg to get it cheaper. None of my friends will pay 29$ (thats around 25€) for it either. In germany you buy a program once and don´t pay for an upgrade.
I also tried several times to make good things in US, but they never got implemented.
In the "users systems" are totally stupid things, while the systems that i did send (like a dwarf galaxy consisting of several hundred suns) were completly ignored. But a senseless Pandora System made it into US...
I also made a binary neutron star system, that orbits in very close distance and is orbited from dozens of planets. Its stable and i did it long before US " Beta was released.
I lost any interest in participating in this anymore. The niveau of the community sinks very low too.