Well, I can give you a review of my DeWalt DW723. I bought it from Amazon for ~$170. However, to really make it work well, you'll be needing another pair of DW7232 support/stops. That takes the price to over $200.
Advantages: It's extremely sturdy. It should be since it weighs 35lbs. The extensions are rock-solid, allowing for very repeatable cutting to length of stock. Also, I like how the stops on the DW7232's flip up and down yet return to the exact location each time. Again, very accurate and repeatable. The extensions go out a ridiculously long way (16' total). It's very easy to mount/dismount my DeWalt 708 using the quick-connect feet. Sets up and breaks down very quickly.
Disadvantages: It's heavy. It doesn't have wheels or a good way to hang it on the wall. It's a little too big to fit anywhere convenient. No adjustable leg for use in uneven terrain.
Summary: I like it. I haven't seen anything better despite its lack of some of the innovations of its competitors from HTC, Delta, or Craftsman. The Bosch TracRac wasn't out when I bought mine and that looks intriguing, but I frequently trim 10' boards so I like having the 8' of support on either side of the blade.
Hope that helps.