new fruityloops is as good as anything out there these days i reckon, and i've always liked the gui with lots of buttons, knobs and other graphical controls for absolutely everything... since i got the producer version (v4 i think?) with routeable mixer and proper automation i haven't ever felt the software was limiting what i could do, and thats definitely a good thing :green:
FL 6 is out now. I'm pretty sure tracks (.flp) are backwardly compatible, though they will sound different when played for the first time in FL6.
There is a huge difference between v2, which was basically a drum machine with a few synths in, to FL6 which is a fully featured studio out of the box, so you should have fun updating your old tunes.