Hey, I'll just tell you what I did and I think you'll see the benefits. I took the intro gen chem my fresh year, and last year (sophomore year) I took physics, ochem, and intro bio. I then took the mcat in August. Now the benefit is that I really didn't need that much prep for the mcat, I studied for maybe 1.5 months of solid prep, and since everything was fresh in my mind, I could do it. Secondly, I don't have to worry about taking the April exam during my classes, most of my classmates are studying for it and its so much easier to focus on your course work and not on both. just my $.02.
hehe I've always wanted to say that!