In my opinion, you should never buy stocks based on an emotional connection. You think they are good cars and believe in the company so you want to buy them. In many cases, that is a recipe for disaster as I liken this to betting on your home town sports team because you know them, love them, and believe that they can win every game. Product quality is just a small portion to look at when purchasing stocks, especially in the short term.
The nice thing is, it's a personal choice and if you personally think it's a good investment and you can afford to invest and wait, by all means go for it.