I've got one, and it's a piece. The bottom is starting to wear (and I've only used it once or twice a week, for the past few months). Mainly it feels flimsy. I only got it to hold up in the interim, while I put together my custom designed bag...which I have been "working" on for like, 2 years. Bought the ballistic nylon, military grade webbing, etc. Cut all the pieces, just haven't gotten around to sewing it together.
If it weren't for my stubborn determination to make my own (plus the damn materials cost me as much as just buying a quality bag), I'd spring the extra $150 to get the Upper Park's Rebel. I didn't buy this bag for the design, just the price, but after using it, found I really liked the upper pockets for putters and my more oft used discs.