I use a StudioLive Classic 16.0.2. As of right now, I do all my processing in the box with plugins, although I do sometimes use the "Post" button on my mixer add compression, gate, and EQ from the board (all digital effects) before it gets to my DAW. Since the mixer has solidstate XMAX preamps to begin with, how worth it would it be to invest in outboard PreSonus gear? Tubepre? Studio Channel? Those are the pieces I'm most interested in - I'm welcoming informed opinions (knowing it's subjective anyway), but I'm especially interested in hearing from anyone who has directly compared the Tubepre vs onboard StudioLive preamps.