For my palette it's a very subtle flavor contribution. I couldn't pick it out in the oatmeal stout I did, but I thought I could pick up a faint toastiness when I used it in an amber. Might have been placebo, or the maris otter I used though.
Try it out, everybody's palette is different. For me it's not really worth it.
As for the salts, get your chloride up to around 150 or so.