I'm new to the 5 string and have been testing out different B strings on my Squier VM Jazz V. That said, on 4 string basses I normally use DR Hi Beams of DR Fat Beams so I figured I would just get some 5 string sets of those and all would be well. Keep reading.... Here's some observations that I've made of the very limited amount of B strings that I've tried so far and I am shocked at what I hear: 1. Stock Fender Nickel B (I'm assuming it was a 130) - Fairly decent but quickly changed to DR Hi Beams after I bought the bass. 2. DR Hi Beams 125 - Very disappointing. Clear open note but pretty much an undefined mess from the 3rd fret up. I figured the round core and small gauge might be contributing to this so I tried... 3. DR Hi Beams 135 - Again, very disappointing (and I'm a complete DR fanboy for the 4 string sets). Undefined and not even as clear open as the 125. 4. D'Addario XL Nickel 130 - Fairly decent open to about the 5th fret. Much more pitch stable than the DR round cores. 5. D'Addario XL Nickel 135 - Now it's getting better. Much more definition but being used to the zing of stainless I decided to try... 6. D'Addario Prosteels 135 - Thinking ok, the Nickel D'Addario in this gauge was pretty good, these will just be a zingier version. Wrong. Very hollow sounding and not as much pitch definition as the nickel, but much better than any of the DR B strings I had tried. Being a DR fanboy, I decided to give them another shot with... 7. DR Fatbeams 125 - I know, 125 round core was probably going to be problematic and it was. A little more defined than the Hi Beams but still a mess, especially compared to the D'Addario XL Nickel. Thinking about that, I decided to try the XL nickel instead but in a bigger gauge. 8. D'Addario XL Nickel 145 Tapered - Good concept but to my ears the taper adds a lot of warbling in the upper registers. I set it up the way Roger Sadowsky would (taper B strings like to be one of the farthest forward bridge saddles). There was just too much taper in the speaking length of the string. Notes down low were good but not as good as the 135 D'Addario nickel. Now to the shocker... 9. Ernie Ball Nickel 135 - First a little back story. My son uses these on his Spector Legend (35" scale) because he is a very aggressive player who tunes as Low as A on occasion. He had an extra set laying around so I grabbed it and strung up. So far, this is the clearest and growliest B I have tried yet. Very pitch stable past the 12th fret and even though they are nickel, they sound very stainless like and aggressive. So what have I learned? Don't be a fanboy to a specific brand of strings because you may be limiting yourself. That said, I still have a 130 DR Fat Beams B string that I haven't tried yet but I don't think it will sound anywhere near as great as this Ernie Ball.