I'd give it a 4.5. It's simple, lightweight. It seems a durable plastic. It handled pumping my tires to 43+ psi with little struggle. I do wish this kit came with more mounting "hardware" other than zip ties. Including screws and/or a strap of some kind would be nice. Also there were no mounting instructions provided. Definitely worth the $7.99 paid, and I feel is a good purchase.