I just got a set of SW2000-6 from JustStrings (I travelled to Nashua rather than order over the web). So far I'm very happy with them. I can't remember how the XL's sounded when I first put got them, but the slowounds sound very clear and bright. The B string actually fits in the saddle because it's tapered, and it also sounds much more defined than the XL's B string. The strings have a great slap sound, but I don't know how long that'll last. I have to record something so that I can compare the sound after they've been on for a while.