Since you asked... Although not officially 'maxed out' I am currently at about roughly 75 to 95 percent full of total channel capacity depending on which deck. I personally wouldn't mind seeing Kenwood add/offer additional channel capacity upgrade options that are greater than the current 4,000 channel upgrade option that they currently offer, a channel upgrade option of 6,000 channels, 8,000 channels, 10,000 channels (or even more) would certainly be nice to see added to the available options list.