I finally got to ride Trex today. The dealership was only open until 2pm today, so a co-worker and I headed to his place about a mile from the trailhead. We grabbed a quick bite to eat before riding, then headed out for a quick road warm-up to the trailhead. We rode what I guess was all the singletrack there - the red loop as I recall on the map. This place is a lot of fun, and a good workout - plus if you add in some of the doubletrack roads and Border Trail, you could make a pretty big ride out of this place.
If you haven't had the opportunity to check this place out - do yourself a favor and get out there. There's also a nice creek for an after ride soak just down the road from the trailhead.
-matt