I have a couple, I think they're ok.  Steer clear of the A-series (A500 and so on).  The S500 is their better mid-tower and their Q500 is a fairly nice full tower, although a lot of people are liking the Antec 1030SX for its four 80mm fan positions.  The Inwins are pretty sturdy cases and make a good starting point for modifications like blowholes.
Which one are you thinking about?