Your friend is wrong. Apple DOES allow DVI to VGA adapters to work, but only for those Macs with a DVI port. You have to use the adapters that are appropriate to your computer. My older model MBP has a Dual-link DVI port, so I can use a DVI to VGA adapter. Since your model has a Mini DisplayPort instead of a DVI port, you have to use a Mini DisplayPort to VGA adapter.
ooh, just went ot bestbuy today. and i got the VGA MDP thanks man.