Here's something:
I summarized my first gig in 10 years as an excellent experience, and it truly was. However, I had one minor hiccup during the show; broken E string.
At my request, PJ had Jimmy string my NS-4 with Spector Formula 603s. I don't play nickels, so I would change the strings immediately upon receipt of a new Spector.
I started playing bass in 1988; from the time I bought my first 4-string (BC Rich Warlock), I tried various different strings: Rotosound, GHS Bass Boomers, Dean Markley Blue Steels (I played these for 5+ years). I was always breaking the E string (playing a lot of Metallica - busy on the low E); The Blue Steels lasted a bit longer than the other brands. They always broke at the same place - right on the bridge key. Then, I discovered LaBella Hard Rockin' Steels. From the time I purchased my first set of LaBellas, I never broke another string. That streak ended last Saturday night, after almost 20 years.
Like an Indy pit crew guy, I changed my E string in less than 2 minutes, and we proceeded with the show. However, reliability is as important as feel and sound. I really liked the feel of the 603s, but I have yet to find a steel string that matches up to LaBella in terms of playability, sound, and longevity.
I gotta go with what I know. It's back to LaBella for me!