It's by no mean a bad expansion, I actually bought it just to have classic electronic drum sounds available from a clic away in a format I know well (vsti, drum-like, not like loop-based machines or whatever) when I just want to quickly write an electronic drum part , but I already got it for the same low price on black friday. For someone who does not have electronic drum kits, this is worth the price even if wav packs have better quality sounds (the Deadmau5 packs are actually very good).