Opinions on Using Employer TA

[futuremrsmlb]

This may seem odd to some but I am weighing my options as I gear up to start graduate school.

I have two options for payment which include fed student loans and tuition assistance.
My employer will pay up to $2000 per class that I take as a grad student.
The only drawback (if you consider it that) is I will be required to sign a promise to remain employed with the company for two years beginning the day I graduate.
The online MBA program at University of Mount Olive is only 1 year so I would be done Summer 2017 (based on starting this summer).
That means I have to stay with the company until 2019 at least.

I am on the fence about it due to the lack of advancement opportunities within the company. I enjoy my job and the pay is good. The only thing I see my degrees being good for at this company is for pay increases. I am not complaining about that, I just want to be able to pursue other interests if I want...I guess 2 years is not so bad, right?
Please share your thought/opinions.

Thanks everyone!