Has promise, but it's way too long.
To forewarn, this has a lot of "It's good, but..." in it. But know I'm trying to be constructive in my criticisms. :)
It's got a nice, calm start, nicely harmonised. It gets a little odd at 0:49, I think it needs to get to where its going a little faster, if you know what I mean.
The entrance of the pan pipes at 1:05 feels a little abrupt, like it needs something extra to bring it in with. The entry of the brass at 1:13 however, is very nicely done.
As you mentioned the string samples, I'm going to jump in and say the snare drum irritated me. Snare drums as I view them are meant to be pretty sharp and bright sounding, whereas this one sounded kind of muddy and muffled, as if it had way too much reverb put on it.
I like the brass harmonies at 2:15, but much like the snare they felt a little distant, especially as they were the only thing playing. What's going on at 2:26 sounds cool, but not cool enough to go unchanged for an entire minute. Though in saying that, the recurring melody like the one at 3:17 is a nice touch.
I hear what you mean about the violins. If I were you I'd try and go into the AP forums, I'm sure there's a thread or two about string soundfonts that you could raid. But to be fair, you don't help yourself by having the violins be the only thing playing, and again for a very long length of time.
Which leads me to my main thing about this: It's way too long for what's going on. There's nothing bad harmonically or melodically about it, it's just that you have long sections of one instrument or two doing very similar things, you could cut the brass/violin solos in half and not be very much worse for wear. If you're planning on keeping it this length you need to add more instruments into to, just to give it a bit more colour and variety.
I appreciate this is a WIP, so maybe I'm being a little heavy-handed in the criticism. Make no mistake, I like the essence of this piece, I think it has a lot of promise. But equally, I think you have a way to go before this is totally finished.