Was wondering if anyone had tried this option vs. the closed-back cabinet. I may be getting a new Mark V soon, and generally like the sound of open back cabinets, but the closed back seems like the standard option for a Mark V. I'm wondering how different the sound would be, what the Mark V sounds like with the open back, and what I would potentially lose by not going with the closed back. If anybody has hands-on experience, I'd appreciate hearing about it.