I recently purchased the Fantom Cross. I've written about it on my blog at http://stp2005.blogspot.com/
(look under the I need a new bike)
I've only got about 50 miles or so on the bike but here are some of my first impressions:
The build quality seems very good. I haven't had any problems with anything at all.
The instructions that come with the bike are useless. Being my first 'real' bike I ended up taking it to my LBS to have the brakes and cables setup.
There are only two front sprockets. I live in an area with a lot of hills. Not having the tiny front gear is being felt. So far I haven't had to get off the bike but came close on my last ride.
The bike looks really sharp in person. The 'flaming red' color is very nice. The bike feels super comfortable when riding.
I think for a commuter it is a good bike. The 32cm wheels run well on the road, but have some tread in case you need to cross a few trails.
I think for the price (I bought off of ebay too for $647) its a very good deal.
My only wishes: that it had come with 3 gears up front. That the shifter and front had 105 level equipment to match the rear derailer.