ImmunoANT said:
Am I *happy*? I suppose I have my good days and my bad days. Grad school is no picnic.
On the other hand, nothing interesting is easy, and I don't doubt my commitment to science.
Regarding just getting an MD, you can certainly do that, but I think it's much more difficult to pick up your stuff. You have to pay your dues at some point, and if you start learning as a postdoc you have a lot less leeway to screw up.
Grad school is a time to learn how to do things you'll need later. You're going to need to know how to plan and run an experiment, how to interpret your data, how to present them, and how to apply for grant money. If you have to pick up all those things on the fly when you're already into the postdoc stage, you'll be at a pretty distinct disadvantage.
Also you have less exposure to different fields, and so you have to choose your field more or less blindly.
Finally, med school alone is an expensive proposition, and research careers don't pay the fat salaries that will allow you to pay off your loans with relatively little strain. Try paying back $100+K in debt on a postdoc salary.
All in all, I think if you already know you want to do research (for sure), it is worth your while to get the dual degree. If you are *not* sure, it's better to go for MD + 1 research year. That will let you figure out what you like without too much of a time investment.