FWIW, I work at a high end car dealership, Jag/Land Rover/Volvo/Caddy/Infiniti. And all the brands have the same set of certified standards that doesn't really make up for the price increase. In our dealership and others I have worked at I can go as far to say that if you are buying from a reputable dealer and the car is not a salvage, then in most cases if a car has a mechanical issue it would be taken care of. This doesnt include putting new brakes on every car or new tires because that gets expensive. A lot of certified cars just mean that it comes with a additional warranty (most being 12 months/12k miles) and that the exterior body has been repaired/spotted in/touched up.
When I bought my volt I specifically asked when it came in to not certify it because I didn't want the markup. If you want a additional warranty because it will help you sleep, you can buy that separate from car, and in most cases a lot cheaper (Dealership mark up is 200-400% most cases)
The last dealership I worked at was primarily Honda used cars and I can say that with a Honda Fit you should sleep easy not being certified. It may need shocks, brakes, tires, but the engines on those things I have seen go through some real hell and still run like a champ.