I've had mine on for almost year now. These strings will definitely last for quite a long time. Even after so long, the strings still have a lot of the brightness and clarity they had when they were brand new. The playing feel is great as well. The 130 gauge 5th string is perfect for B, but holds tuning reasonably well even when dropped to A.
Overall a highly recommended product for anyone looking for a good quality 5 string bass string set for a decent price.