I saw Plini's live show two weeks ago, where the bassist (Simon Grove) was using one of these, and was disappointed by how much thinner & hollower it sounded compared to the tone he got out of his LeFay before. Even the Sandberg he had before that...
Came across one (5 string original) in the flesh in a local shop in Tokyo, so thought i'd give it a spin - in part out of personal curiosity, in part, to share the experience with you guys . The price here is similar to the UK - around £3k equivalent.
In this price bracket - sadly - it felt like the worst finished bass I've played. The fretwork was ok, but a few frets were sharp. The "out of the box" setup had action around 4mm - the guy in the shop said it came in like that & they'd not really adjusted it. He was averse to adjusting it much, but we dropped the action to where it was more playable.
I also got told that the finish on these is so thin that it scuffs very easily and the other bass in the shop (a 4string) was already scratched, hence "please don't slap on it". That suited me just fine... but still. The knobs felt light and a few pots were mounted off-of vertical. None of this is obviously tone-relevant, but doesn't inspire a quality feel for £3k instrument.
As a side note - I'm not writing this out of snobbish disregard for Indoensian-made instrument: i've played many Ibanezs that were great, and indeed even my Squire JagSS felt solid!
The sound, despite the Nordstrand pickups, was oddly hollow. Didn't have much time to fiddle with the preamp, so played mainly passive - but the first impression wasn't encouraging. I'm sure that with more knob-fiddling & passionate EQ'ing you could get any modern sound you'd like - though given what I heard on stage with Plini - (i think the bassist uses a Helix rig?), I still preferred the tones from what he'd used before.
I liked the satin finish, and the shape of the EndurNeck - and the low weight would certainly be a bonus in longer term playing. Given the body shape & general alignment, the bass sits very "close" to the body and it's easy to reach the top frets. The fret angles weren't much of an issue (i've owned a Dingwall combustion before), and the 35-33 scale did feel a bit easier to play than Dingwall's 37-34.
However, given that for a comparable price a Canadian-made dingwall (perhaps even a Super P or J with a similar scale) is easily obtainable 2nd hand, for me this is a tough sell. Even the China-made Combustion, at half the price new feels like a much more solid instrument.
In terms of new price - for less than the Strandberg you can get a Japan hand-crafted top of the range Atelier Z, Bacchus, or even an FCGR Dulake/Rhino, all of which are impeccably finished and will come (at least within Japan!) adjusted to perfection, with excellent follow up service. It appears that a few top-tier UK luthiers would also deliver similar quality at that price.
So: at about half the current price, I'd consider this bass, and would happily mod/tune it to where I'm sure i'd be happy with it. At the moment, it's a hard pass from me. I wonder whether the one I got my hands on was (as we sometimes say) a monday-morning factory special, and i'm curious to hear what experiences other will have when you get the chance to try them.