http://www.dell.com/content/topics/segtopic.aspx/dpa_learnmore?c=us&cs=19&l=en&s=dhs&~ck=mn
ok so I just looked this up out of curiosity, I guess I was imagining some sort of big business discount type thing in my head.. but no it's not that at all, it just looks like a credit card type thing. It mentions something about 'discounts' but doesn't mention how large those discount are, usually a sign that they are quite small or only applicable to certain items. I can almost assure you that your father will end up paying a lot more just because of the financing charges.
I'm guessing the real reason your father wants to do this is because he can't afford to buy the computer outright, or simply one of those people that doesn't realize the true cost buying/leasing items in installments. If he can't afford to buy it, and you don't truly need this laptop, I would recommend not buying it all. However if you don't really care how it impacts him financially you could always mention they offer a financing option for Apple as well, the Buy it Now option or the Visa Juniper card that you can apply for at checkout for the Macbook.
Also is there any way you should try picking out a comparable laptop from Dell and configuring it to your preference. I bet it won't be any cheaper, in fact it will probably be more! I just looked up one with comparable specs to the one you mentioned in the Macbook size, the M1130, and the 2.0 ghz ones start at $1799! There were a few things that were admittedly better on the Dell, llike the graphics card, but not enough to justify the price.
Also remember that the power adapters for Dells are
heavy, this is a big deal if you're going to be using it for school and lugging it around everywhere. I also remember paying a lot for the extended warranty, and I don't think you can buy that later like you can with Applecare.
you also might want to wait for the rumored update of the Macbooks thats supposed to happen in the next month, like I am