After many years of playing, I'm pretty set in my ways. Early on, I tried a bunch of strings and settled on EXL170's. They sounded great on my main player, lasted pretty long and the price point was right on. I haven't even bothered looking at or researching other strings. So last week I needed to order some more EXL170's, went to amazon, typed in EXL170's in the search box, clicked the prime checkbox and up comes the list of strings. But wait, what is this? Amongst the listing of EXL170's, listings for EXL170BT? So I come here, read this thread, think why not give them a try. I didn't think I'd like a set of strings better than my trusty EXL170's. But oh my god, these are better! I strung up my bass a couple of days before rehearsal and at rehearsal gave them a full workout. These things are great! Thicker sounding, when I want it, they sound like a piano, if I want it, left me smiling at the tone that was coming out of the crappy rehearsal studios rig. I just hope they last a while.