The new volume builder/mesher and the introduction of fields are two great additions to the software. I've worked with the software since V7 and recently started to use the software again in my job as graphic / motion designer. Easy to understand and still very stable. I can't say anything negative about the program!
The only regret I have is that I've upgraded from V17 to V19 last spring, only to discover that there is an upgrade offered now from any version directly to R20. Could have saved $1200 by waiting a bit longer...