I've had Nickel Low-Riders on my bass for over two months and last weekend, thinking they were going dead, I popped some XL Nickels on. The XL's are a bit floppier and seem to clack against the frets a bit. They also require slightly more neck relief.

They lasted 24hrs before the DR's went back on. The Low-Riders are great strings that just seem to cut through and sit in the mix with a clean, punchy tone.

They don't seem overly bright; even when new. I think the higher tension may have something to do with their tone. Great strings.