Great and easy application for game art visualization. It allows for the importing of models, application of textures and lighting for presentation. I enjoy its integration of PBR, but currently each engine processes PBR differently so it is a little tricky when texturing from that aspect. Marmoset 3 also now supports animation again and has a more robust lighting engine. As well allows you to export your scene to upload to view on other sites.

The quality of the render . His simplicity . The creation of custom material and the integration with Substance. I like the recent baking tools . They are very powerfull and easy to use.

What I like the most about toolbag is how fast you get results with little effort. You can display models and setup lights with ease so you can see the render as you move things around. If you have animation attached to your model you can play it as well. The price is quite accessible and it's being updated constantly with new features.