Another vote of confidence for Newtone strings here!
I also used them in the 90's like BigRedX, as a result of the costs of 6 string bass sets here in the UK, for the cost of one set of DR's from The Bass Gallery, I could get two custom made sets from Newtone, and they were just as good! I stopped using them too, in favour of Warwick Red Labels, this is getting spooky!
When I started playing 33" basses however, I wanted to get a better fit and Newtone came to the rescue, and haven't really used anything ever since.
I now play 31.5" basses exclusively, and Newtone wind me a perfect set, 125 100 80 60 40 28 - wound on heavier cores to make them feel tighter, much like the same set on a 34" bass and they work amazingly well.
I only wish they made flatwounds...
I find that they last a long old time, as long as any other strings I've had, I always found Rotosounds dulled VERY quickly for me, but everyone is different and perhaps my sweat is kryptonite for Swing Bass strings.
Eude