Bought these purely for the double pack and that I've never tried D'Addario strings before. Strung up my Jazz bass with these, and was immediately struck by two things: The bright, full sound and the tension. I did really like the sound of these when I first put them on, but found the tension too high for my liking. After about two weeks, the strings didn't have a particularly great sound and I would consider them 'dead', but then I do crave a very bright and twangy sound.
A lot of people do really like these strings, but they're just not for me and they're not exactly breaking the bank.