I just ordered a set of D'addario EXP Reds for my P-bass. The info and opinions out there online are lacking and I got way to curious to leave them alone. Currently, I'm using EB Cobalts which worked out well for me although they have dulled and give me a "scooped" tone now. Out of the couple of strings I've tried, Rotosounds SS have the nicest initial tone to my ears. they died pretty quick though. Dunlops SS had a nice tone too but looking for something different. DR Lo-Riders SS felt great, lasted a good amount of time but was missing that mid-growl. DR Hi-beams were too loose for the way I play. their sound was ok. I'll share my toughts on the EXPs when they come in.