I've never played Solstice, but this track was an instant hit for me. Some of it reminds me of the band Battles, which I've enjoyed recently.
The contrast between lo-fi drums and the brighter foreground instruments creates a lot of space in the mix, I think. Either way, the arrangement is/sounds deliciously sparse, even with all the many many notes played. I agree with other posters that the sax sounds a bit artificial, but after a few listens it has started to sound more like a "feature" than a flaw. (The most bothering thing about the sax to me is that sometimes there's a jarringly louder note in the middle of a run, it's a subtle effect but makes it sound like it was cut-and-pasted together from two takes or something.. well, to me at least.) But any way, that's a minor criticism on an otherwise fabulous track.
Yay, first post.
--Eino