If you're after THAT bulky and punchy Motown bass sound, look no further...
Although I myself was slightly irritated by the "Vintage 54" and "James Jamerson" marketing gimmick stamps on the package, I have to admit I was extremely surprised how huge affect these strings just made. If one's after the authentic old school "thump", these strings will certainly produce it. So, as far as the tone is concerned, this is it.
The string gauge is also an essential factor: I used LaBella 760FL set before for a couple years, but couldn't reach that thumpy sound. 760M and 760FM nailed it immediately. So it's not all in your fingers... :)
There are a couple things to complain, though.
First, the strings, and especially the E-string, break rather easily when bent. This might be a real issue, if you prefer loading your strings thru-body, or if your bridge forms otherwise a considerably steep angle. LaBella is offering sets precisely for thru-body usage, though, and I guess that this issue doesn't plague them.
Second, the price... Yes, they are THE classic string, and of high quality. But my personal supposition is, that one is paying relatively lot just for the brand.