I'm pretty sure lots of us have...
They are very bright and metallic sounding in the beginning with lots of zing and clank (think big bright angry piano), which dies off relatively fast - After that they tend to mellow a bit, but not too much, tough...
The strings themselves can be quite rough on the finger-tips, unless you already have calluces, and do add a significent bit of string noise when doing slides.
The "older" 66 Swing Bass strings (orange cardboard package) have quite a bit of silk at the ball-end, which may need to be stripped off, when used with a 3-point bridge, in order to clear the saddles. The "newer" (orange airtight plastic package) strings are suppoosedly made with less silk at the ball-end, and can be used as they are with a 3-point bridge - I'm sure some other group member can confirm this, as I haven't bought any of these yet...
Check out their website for a video showcasing them:
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