Ya they are good for a few shots...but if you are purchasing a lense it won't be just for a few shots...it is going to be for a range of uses ...unless of course this is exactly what you want...in that case go for it. But, you'd most likely get far more use out of the lens I linked to...for you!
Thomas Edison said,
"I have not failed. I've just found 10,000 ways that won't work."
Think about that the next time you want to give up after 2 or 3 attempts...