I had a Sire P8 that was a terrific bass. Everything about it was top notch, and I had no concern at all with the B string.
But...
I sat in Andertons and tried six basses of the same spec when I bought it, and they were all very different. Yes they had the same core tone, but two weighed more than a small planet and two had dodgy electrics. I don't remember the B strings being particularly bad, so that's a plus. The one I bought was a superb bass and was the perfect combination of playability, weight, tone and QC being spot on. The others, much less so...