I've only heard the 99. It was against a BAT 3i and the Rogue blistered the 3i -- made the 3i sound crude in comparison. Prior to that I auditioned a 66 against the 3i and would have rated them equal, although different. I bought the 66, but price was a factor (demo 66 LSR - $800, BAT ($2000, remote extra $500). I have not demoed the 99 v. 66, but can only deduct that the 99 would also humble the 66. Unfortunately, haven't heard the Line 3.
Mike
Mike