I will post here what I have already write on Raf Clouds forum:
"don't have words... It works like charm. I will donate some money as soon as possible. I would vote your extension and I confirm to whom it may concern that is the only tag cloud extension for joomla that it works indeed, free of charge. Also, I think that I support your extension on Romanian joomla users forums or whatever. There is more than six month that I looking for a Joomla tags clouds extension, but nothing works so fine, nothing is so easy to use, no one had so fast and kindly support.

Tnx from all my heart.
Best and kindly regards,
Robert"

just for the records: it works very fine in legacy mode too.

Simply the best. Great product, great support!