[Steve Viegas]

Dan,

I think it depends on what you are trying to achieve. If you are looking for an MBA for personal growth (not professional) then by all means, you should pursue it.

If you are looking for professional growth, I am not sure it is going to help much unless you go to a top business school. My reasoning is this:
1. The experience you are gaining now, at your job will likely look better than an MBA to a future employer.
2. A second tier school is as good a place for an education as a first tier school as both depend on you, an employer will likely not see it that way.
3. A second tier school will not give you the contacts that you can make at a top school. I personally believe that the contacts made at a top school are the main reason for attending that school. If you do not have the personality to seek out these relationships and use them (and I am not saying you do not, I do not know if you do or don't), then I would say that a top tier school is not worth it either.
4. I believe an MBA will allow you to start "at the middle" as opposed to the beginning in you career, but if you are already "at the middle" I am not sure it will help.

Now, this advice is coming from someone who went to a second tier school for their undergraduate degree and I have not pursued an MBA so take it for what you will.

Steve