The most impressive thing is that it's free, so there are no hidden costs or fees to worry about! I don't have any complaints at this stage but would like more options in terms of rendering materials (ease with which you can edit textures).
If your looking into using an API then definitely go through their tutorial first as they do not provide support if something goes wrong after installation/configuration etc - just make sure everything works ok before committing resources towards anything else such as hardware upgrades!! We use re-Busfarm software daily throughout our business operations from client meetings via email & video conferencing applications along side Microsoft Office 365 apps including SharePoint Online / OneDrive online storage services where we store files securely away off site too.