I'm just like you, I hated trying to hand make things instead of having a clay gun. I don't have that one though. I got the Makins clay gun at Hobby Lobby. It's very easy to use and I think it's considerably less expensive than the one you're looking at, especially if you use one of their 40%-50% off coupons. I think it cost me somewhere around $10 with a coupon.
Here's a pic just because I'm really impressed that I've learned to post them

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Yours would be even easier to use because of the trigger action, just depends on how much you would use it I think. For the amount I need it for, this one is great.