To answer your questions:
What do you like or dislike about the program you use?
I don't dislike a thing about it!! =)) I can't believe I ever scrapped without it!
Why did you choose the program that you are currently using?
I started digi-scrapping with PSP X but when I switched over to Mac, I had to upgrade to PSE4 since they don't make PSP X for Mac and I didn't want to use a Windows emulator. When I upgraded to Leopard, PSE4 kept crashing on me, so I downloaded a free trial of CS3 and quickly fell in love!! Since my trial was going to end on my birthday, my DH surprised me with the serial numbers for the licensed version of it! =))