I have the SFL2 and was wondering the same thing about the Line 2. As I have bought Sonic Frontiers gear since their inception, they were quite honest with me and told me that they thought the SFL2 bettered the Line 2 and was very close in sonics to the Line 3. Not sure what the changes were like since the SE mods. As noted before, the SFL2 is a two box design. I have been thinking of going with a single chassis unit and am torn as to what to try. Possibly a BAT of some type.