They aren't for everyone...lets face it. I don't like them much myself, but the one I do have does work, and it works great.
Too many people get in too big of a hurry and rush it. They don't check the parts when the get them, etc.
Why did I do it? I had an extra Puch motor and got a good deal on the kit. I had fun.
Simple as that. Read, don't push it, and be carefull. Your pushing a machine beyond its limits, and its going to snap if you do think it out first.