Looking for feedback on Maestro

Has anyone here used Maestro Conferencing? I am considering this for groups of about 25-50 adult students, possibly more. They provide break-out rooms, which seems like a nice feature that would allow groups of students to work together. There will be some International students, so that is a consideration. They provide VoIP and Skype.

I'd be most appreciative if anyone here who has used it would be willing to share their experiences with me.

Thank-you,

Camille