I've run a Bulldog for around 2-gallons.

Still going strong; not cracked or starting to crack.

Has a little war wound on the left front where it got pinched in the front shock at some point where I didn't trim the wheelwell back enough; but other than that she's good.

It flexes quite a bit more than the stock body in the bed area, but seems tough.

If you like the styling I'd say it's a fine choice and certainly isn't worse than the stocker. At least it hasn't been for me.