I was afraid at first, because it was very cheap (129 zloty, while other courses cost hundrets of euros),
Thanks for the link, it looks interesting. However, you might want to note that the course is actually 159zl for four hours and the the Kurt Scheller Academy one-day courses start at 255 zloty (for the courses with Kurt himself). I guess that the course you went on must have gone up in price since you went on it and the other courses must have dramatically dropped in price.