I've just spent last weekend on a 2-day Sequoia course with Eric, and enjoyed every minute of it! We spent quite a lot of time on source/destination editing using some material I had recorded (violin/piano), then spent the latter part of the course concentrating on Sequoia's mixing capabilities. Sequoia's source/destination editing and crossfading capabilities are worth their weight in gold, and definitely worth an upgrade from Samplitude Pro.
So, many thanks to Eric for giving up the weekend before Christmas to train me - he's an inspiration. Oh, and his coffee is second to none too!