We've focused on professional artists, and support all the main formats that they use. The difference in load time is because a lot of what's in our public gallery is from ZBrush, 3D-Coat, or Mudbox - high res sculpts that were not meant for realtime. It's more testiment to our processing engine that we can make these run as well as we do. Not exactly apples to oranges comparing these sculpts to Sketchup models on Skethfab. We've written about the comparison to Sketchfab here: http://verold.com/blog/2013/1/13/verold-studio-vs-sketchfab-...

I played around with both after reading this article, and while you're right that there's a big resemblance, that sketchfab is very fast, and supports lots of formats, verold seems a fair bit more sophisticated in what you can do: the material editing in verold seems to support many more types of materials, and as best as I could tell, verold allows multiple uploaded meshes to be positioned within a single model, whereas sketchfab is limited to a single mesh upload.

Both are fundamentally rather limited though, more like "model tweakers" than real editors, as you can't create new shapes / meshes in them or edit the geometry of existing meshes.