The sail panels are a very quick upgrade, took me about 30 minutes to install my tweeters in there and the wiring is simplicity itself. Putting the tweets up there helps to raise the soundstage from your knees to in front of your face where it should be. A worthwhile upgrade when you get the inkling and funds of course.

One other thought is that one-day when your inspired to bypass the bose amp you'll find the speakers suddenly have more highs and lows since the bose amp equalizes the speakers out to create the BOSE sound.