u can use old software w/ the new drive as long as the software supports the drive and the software isn't locked to work with only the old drive. i don't think musicmatch is locked, but if u're using an old version u might have to update it to recognize ur new burner.
u might have read that some ppl have problems w/ nero, but there will always be ppl who have problems w/ every program. nero wouldn't be as popular as it is if it wasn't a good program, and i'm sure an overwhelming majority of ppl have no problems. if u get the impression that every post u're seeing about nero in this forum is negative, consider this: who would make a post just to say they're not having problems?