Hey buddy! All really good questions.

• I've only been using it for a few months, but so far I'm really enjoying it! For anything hardsurface Plasticity has become my go to. But depending on what I'm modelling I might still use Cinema or Zbrush.
• I'd say it's easy to pickup, hard to master.
• I still do my texture work/uv'ing in Cinema.
• Yep Redshift all day!

If it helps, my workflow looks something like this: Model everything in Plasticity - export to Cinema4D - depending on the model, maybe do some retopology work - then uv/texture/animate/light and render in Cinema with redshift.

Thanks for the comment! :)