Don't know all to much about them but what I have read is not all to positive. ASG is based in the Netherlands and quite a few Dutch students have followed the program so suggest a posting on Dutch bulletin board.
www.cgi.niesjewolters.nl/Ultimate.cgi
(postings are all in Dutch but I'am sure if you make an English posting in the forums beroepspiloten = proffesional pilots or piloten in opleiding = pilots in training, it should be no problem)