I bought a LTD F-series bass to down tune to A. These strings really give the feel I was looking for. Still tight with a punchy and still clear sound even when down tuned to A. The A-string (normally the B-string) still gives a good high quality sound, but a still a little floppy (as you can expect when down tuning).
DR claims to give you a string that is made for down tuning, and the are spot on!