Altec Lansing FX6021 - 2.1

I just ordered these speakers and wanted to know if they sound good and if they are a good choice for my powermac g5. I know they will match my cinema display and my powermac great. I heard people said the bass is weak in these speakers is this true. I only listin to rock music so i dont need alot of bass for my music. I got them 50 dollars cheaper then what apple is selling them so $199 isn't that bad.