I bought my Aston Martin DB9 several years ago and although I have had some wonderful times driving it, and I know objectively it's a great car, I will have to sell it soon as it is causing problems with my back. Obviously this won't be the case for everyone but be warned: the DB9 is very low and it could be an issue for you. Probably best bought in anticipation of a mid-life crisis rather than during one, so you have a bit of time to adapt to the driving position.
Other than that the Aston DB9 really is a great car. It's not exactly efficient but I drive it as my main car purely because it makes me feel so great. I get about 14mpg which is obviously not good. Great performance even in an urban setting as you can pretty much dodge in and out of traffic as the acceleration is so easily done.
Reliability wise I've had very few problems, and those that I have had have been sorted under warranty without issue. The driving position is the main problem, and the fuel efficiency is pretty criminal but what do you expect from such a great sports car?
The wife wasn't all that impressed when I brought my Aston Martin DB9 home, but she's got her Chelsea Tractor, this is my toy. And what a toy! I'm honestly not all that up to speed (see what I did there?) with the technical specs but it drives like an absolute monster.
The handling is sound, and the ride is comfortable (adjustable suspension), and it gets 0-60mph in 4.8 seconds, wahoo!! I suppose 18 miles a gallon is a bit silly, but you get what you pay for and this thing is worth every penny.
I should say, it can be a little bit shaky on the corners sometimes, and I have heard other people say they had a lot more technical faults than I have. Also on the down side, the two 'rear seats' are a bit of an in-joke, but there's space in the car for two people and their golf clubs. Not really a family car, but for an electrifying weekend runaround, look no further.