I bought a set of D'Addario XL's (45-105) for my P bass about four monts ago. For me those are the best roundwound strings in terms of sound, feel, right amount of tension, consistency and life time. I don't like new zingy strings and that lasted only about 2 or 3 weeks, after that the've been just the string I need with a consistant tone, and it seems it will last forever!. A 2 pack for $21? that's a steal, and maybe I will never use the other one, well just for a backup. Waiting for my GHS's pressurewounds for my jazz and my GHS's precision flats for my other P. The chromes are off my P bass for now.