Well circus schools are only tools so your question is like asking me what good music instrument there are. It depends what sort of music you want to play.Montreal and Kiev are known for their very high level of pure technique though artistically rather traditional. Then in France a lot of schools are focusing on the artistic individuality. The Cnac and Fratellini are doing a good job. The Lido in Toulouse is probably the most qualified for pushing circus in an innovative manner. Even though sometimes criticized for a lack of technique.Finally, Doch is in my opinion a good compromise. They encourage the innovation of disciplines and keep a rather high level of technique. I must mention that Jay Gilligan and Ben Richter, the two main juggling teachers in Doch are on top of their game dealing with juggling as an art form.With your level in diabolo I would recommend you Doch, the Lido or another school in France such as Fratellini. The Lattet has the specificity to pay the student monthly. You can ask Nino Wasmer who is a diabolist in that school for more info.It all depends on what you are interested in. If you like only technique for its sake I wouldn't necessarily recommend circus schools.Another way, is to create your own teaching by taking workshops often a week long. Juggling workshops, theater workshop, dance, opera, mime, art performance. It is very efficient because you work directly on your needs (in circus schools, you will sometimes waste time or not like stuff) but the downside is that it is expensive and you need to be strongly independent and determined because it is not conventional.A last word, to me the biggest points of schools are the space, that is an environment to train create try out, and the people around you who are a source of inspiration. The rest comes from you only.
Ronnie, I am glad to see you asked Guillaume about that Did you make any decision?