Silo is a good modeler. It's missing some of the bells and whistles of more advanced feature sets like modo and Max but that's to be expected, as development on the app has stopped for the most part. However, that should not detract from the fact that silo is still very capable and to this day, has one of the best interfaces for working with a mesh.  While I do often wish that Nevercenter would pick up development on it again, that hasn't stopped me from finding excuses to use it on all the 3D work I do.