I got mine today. It is stiff, but not so stiff or thick that I think it wouldn't relax over time. The plugs are bulky, and a quick attempt to disassemble them failed, making me think they would be hard to repair. They look to be glued or sonic-welded in place.
With an active bass, I heard little difference compared against my usual Canare/G&H cables. I sort of thought I heard some more brightness, but going back and forth I was not convinced, and it seemed like what I heard could easily have been placebo effect.
However! With a passive bass, the difference is dramatic. My passive bass has the single pup wired straight to the output jack, and my DI's (a TAB-Funk V71 and a Focusrite ISA One) have high input impedance, so neither end is contributing much loading. But using the Elixir cable, there was a huge increase in high-frequency content, including noise. As far as I could tell, there was no corresponding drop in low or mid frequencies, just a lot more highs. One indicator of this was that the signal overall got louder (I'm not only listening, but watching on three different sets of VU meters).
The fact is, I liked the tone of the Canare cable better. All that extra high freq content with the Elixir was not as pleasant to listen to. However if that's something you want, like e.g. if you're a fretless soloist or a user of extra-bright strings, then this cable will suit you fine.
Again though the difference was greatly minimized with an active bass.