Personally, my wife and I find the foam products esthetically unacceptable unless covered or concealed.
As for efficacy, there are graphs at www.realtraps.com comparing several products. There's another acoustics site that has lots of data, but I will have to post again when I re-locate it.
Also, let me join in the recommendation of Brian at SensibleSoundSolutions. Good advice and good products.
Kal