I tried the 4, but wasn't much of an improvement, to me. I like the 3X OS better too. I felt it didn't sound as rich, but that's my ears! I am looking forward to their next board. The EA-7 looks interesting. I'd like to give that a try.
_________________________
Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand
Studio: Korg PA4X/Yamaha DGX670/Nord 6D73/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/ATEM Mini Pro switcher/K&M stand