there are three X's. the first the normal 16ft lg X. then the new 06' mini X's were the bottoms are closed. Then sup' air makes a 3rd X which i believe your talking about which is a small X. It can be used but if your looking to just save money ppl will not like it. The shape is not the same as the big X and its basically used to lay down.
If your looking for a cheap X check out GAP paintball who make Dynasty fields. They have a smaller cheaper version of the 16ft X