I used the RAS-115 quite a bit on a sculpted vanity I made recently; it was my first major project with the sander.  Thing is, it comes in handy for so many other things, like removing bits of thinset when redoing tile, honing natural tile edges, feathering off "I don't know what" from patio concrete, shaping wood (à la sculpting), coping, and stripping paint.  I think it is the first Festool I have that qualifies as a "just get it so the day you need it you have it".

I have a write-up on my blog about it besides the video included below.

Review of Festool RAS-115 Rotary Action Sander with Demo!

Agreed all the way on this -- it is a wonderful tool.

Scot

Great review, P-M.  One thing I learned at Lebanon was to hold the RAS by the angle head in the cup of my hand when scribing or doing coping as you showed in the video.  This makes the RAS much easier to control when doing fine work.