I used the 600i for quite a while. Thought they were great, with the mountable/removable mixer. But no looking back vs the quality of QSC, which made everything sound 10x better.
_________________________
Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand

Studio: Korg PA4X/Yamaha DGX670/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/K&M stand