I think it does require training if you are to follow it correctly. However, I am very suspicious of much of the theory behind it, and many of the claims made and the statistics gievn are not very scientific. I think that there are some interesting ideas in it- I like Lozanov's idea of the teacher as an architect of environment- and the person I trained with was a superb teacher, you can see his site here:
http://www.usingenglish.com/cgi-bin/...ggestopedia&Go
(He's the first entry)
In the right hands, like Lonny's, I think it can be used in a very good way. I think there are some good ideas there, but I also think that there's a lot on nonsense in all of these methods that claim to have found the answer. I am not sure there is a single answer to learning and teaching, and when I read that the divisions of a suggestopdic training session correspond the the golden proportion of the pyramids, then I start worrying.