Really old
Fruity Loops-didn't click with it
Acid-fun for looping play, toy-like, didn't like doing audio on it
Harrison Mixbus-Loved it, but way too unstable. Had to scrap it.
Ableton- Ok, but not a keeper for me
Cakewalk Guitar Tracks 2,3. pro-Loved all of the versions of guitar tracks, and am saddened that they are not a part of the current line-up.
Pro Tools-Was very unstable on windows when I tried it for my personal use. I occasionally use it at a friend's place as he considers it and Macs to be the only tools capable of creating professional results. Over the years i have especially disliked Pro Tools' proprietary business model.
Sonar X1, Artist, Professional, Platinum-I currently use Platinum regularly and like it. It has been mostly stable for me with the occasional odd problem with an update.
Reaper-seemed really messy. Didn't like it.
Mixcraft 6,7-I am currently a Beta-tester for
8. Really like this program. Simple interface, easy learning curve, and gets more powerful with each version without sacrificing ease of use or making the interface fussy looking. Easy on cpu usage. (this program will still run on XP.) My only gripe is that more emphasis goes into loop content and virtual instruments than audio.