Duraball Pro is an expensive, but highly reliable and durable exercise ball.
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Pro It's very durable
The synthetic material is very durable. It's a lot harder to pierce than a regular PVC exercise ball.
Pro Decent weight capacity
The ball can hold up to 1100 lbs, meaning you need not to worry about using it will free weights.
Con It's expensive
Most stability balls cost a fraction of what Duraball asks. You can get pretty much the same value with a ball 5 times cheaper than this.
Con The pump is not included
You will have to find where to buy an air pump and pay extra for it.
Con It has a plastic smell
For the first few weeks, the ball will give off an unpleasant plastic smell. It is rather strong, so you wouldn't want to use it in living spaces.