I have one of the rugged gear models. It's an older model, as I saw a newer one at a shoot and the front wheel swivels. Mine doesn't, but when shooting sporting clays it was the best thing that I purchased. I have been talked into lots of gadgets, this is one of the handiest. However, I really don't use it much at trap shoots, but am thinking about getting a modified golf cart. One that I could use around the ranch too. Anyway, rugged gear cart is a well made, very handy cart. Should last a long time if you take care of it.
KingRanch - Double check that your front wheel is not accidently in the locked position. There is a pin that when popped up allows it to swivel freely; however it has a tendancy to pop down and engage the lock. It probably happens when I'm lifting the folded cart while placing it in my truck.
I have a Rugged Gear and use it a lot more than I thought I would. If you are buying used, try to get one with the solid tires. Only thing you need to watch is make sure the gun holders stay tight. A friend of mine had a gun flip out of one because he left it get loose and it rotated sideways. The one I saw from Cabela's a while back didn't have velcro starps like the one from Rugged Gear. Not sure if they are all that way or not.