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.