This came pre-installed in a hand-made bass from the US I bought a year and a half ago (the TBC in my avatar). I contacted Nordstrand to make sure they were the real deal and they confirmed they were. However, They did not say whether the J pickup was the NJ4SV or NJ4SE. I've made a guess that it's the NPJ4SE as that's what's being offered as a set on eBay.
The bass manufacturer put extra shielding on the bottom of the P pickup, in the form of copper tape.
As for what it sounds like, well I'll go for 'modern' as it doesn't sound much like the pickup in my '62 re-issue P bass or the Wilkinson P I replaced it with. It's quite powerful and 'dark' sounding and I just prefer the more traditional P sound. Took out the J pickup just to sell as a set, although I actually really like it; it has the characteristics described on the Nordstand site for the NJ4SE:
"The natural character of this design is to have a more pronounced lower midrange, and a slightly muted high end. This makes them exceptionally suited to fingerstyle players who are going for a solo bridge pickup sound with good 'bark' and 'heft'."
Not sure about price: they seem to be on sale on eBay for £155 (pre import duty) and these are in great condition, so how about [b]£80 inc postage[/b] to mainland UK.
Edit: to say which bass the pickups came in.