I know that these strings have been around forever, but I just wanted some opinions on them. They are on sale at the guitar center this month and I am wondering if I should pick some up. Are they good for slapping? Are they really bright? Are they low/high tension? smooth or rough? Let me know what you guys think about them. Also, what is the difference between the rotosounds that have the picture of the lion on them and the ones with an older more basic looking package? (They are both swing bass strings as far as I know).