The great thing about GOG is that you can download (or re-download) your purchases whenever you need them. Never hurts to burn a back-up DVD though...
The BAD thing is when your bank has some sort of "firewall" against transactions between you and the company location (due to fraudulant activity in the area, etc.). And so when you want to get that great $6.99 deal on Il-2 during the weekend but cannot procure it even despite telling the bank people that there's no problem but they're like "oh no, sorry current policies state that we just can't do that" and then the friendly support at GOG is like "well, that thar's a *****!" and you're in complete agree ment but there's just nothing you can do...
Perhaps I should try PayPal when I can afford to spend money again...
-Thaeris