Quite good.
Trance isn't a genre that everyone likes, but I like it well enough, and I think you handled it well. The song has a good unifying melody, the instrument selection was pretty good all round, and it had enough diversity to remain interesting. Transitions were also handled well, and weren't at all jarring. Overall I liked it more than a lot of your traditional techno songs. If you were going for more of a club feel, I'd recommend adding a bass beat, but since your weren't there aren't really any flaws to point out.
I'm not sure if you've every tried making an ambiance piece, but you may want to consider it. They aren't too far off from trance, so you could probably pull one off well.
Anyways, this gets a 9/10 since I reserve 10/10 for what I'd consider perfection.