Very nice!
I really like it, but I don't think it's quite up there with Summer Solace though.
I don't know how you'd do it, but I'd like to hear more variation somewhere in there.
And a very simple thing: I think the song would have a better intro if you just added a phrase of *just* the base sound to the beginning, so the first 6 seconds or so were only the cool base sound, because right now you're already introducing the higher pitched sound (i don't know what to call it) and making the sound "focus" before the first phrase is even over.
If i'm not using the right terminology, by phrase i mean the length of the base loop which is about 6 seconds long.