The amazon one sucks...I started with one and hate it. I bought a captain series off grimco.. it was maybe double, but the grommets go in tight and they go in with half the force the chinese ones needed.... I only bought a captain because I had to use so much force on the chinese ones that the cast metal snapped in half.
Hiker also makes a good system, but is more like 5X the price. I'm not sure how much better hiker is than captain, but I'd stay away from the chinese / cheap amazon ones... I regret ever buying one after using a semi decent one - We use a pneumatic grommet machine, the manual was just for quick jobs... But even at the price, the captain was worth it... if its your only machine, you may want to invest in a hiker.