I'd have to say that these cheaply priced dual bullets are a good buy. It's not the best thing to buy, but when on a budget it's definitely the go-to.
The most helpful critical review
Packs a punch to start, goes out with a... well... you know.
Dual bullets are great, however I would probably recommend another product for safety reasons, one that has more than one control, and one with more staying power as far as the cords and motor are concerned.