I was never into bags back when I was younger and when I was old enough to lust after bags, I barely had enough to survive

Now that I am in a position to buy the nicer bags, I still refuse to charge a bag unless I can pay it off at the end of the month. I do however charge a bag on occasion when my various CC companies offer a 0% interest rate for 6-12 months
BUT I still
ALWAYS make sure I can manage all my other financial and family commitments first. Luxury items are great, but getting in over your head is NOT and I would not recommend anyone doing it unless they are sure they can meet their previous obligations
One final note, make darn sure it is a bag you are going to love in a year when the bill is finally paid off!