So if you intend to use it as a kind of debit-card-with-credit-card-perks, or as some kind of emergency backup, go for it.
My rule of thumb is that you should be able to bring the balance of your card back to 0 (after maxing it out) within 2 months. If not, then the credit limit is too high.
My 2 cents.
This.
I use my C/C for everything from online transactions to Point of Sale purchases at the Spar. I don't pay for transactions so it works out fine.
However, I only use my C/C if I have a positive balance of equal or greater value in my other account. At the end of every month I then clear my C/C deficit.
What is quite interesting about doing it that way is seeing how much you spend on random crap seeing as it excludes monthly debit orders for insurance/med aid etc.
It makes you a lot more conscious about your spending when you have to pay a lumpsum out of your savings account to clear it than when you simply deduct small amounts off your savings acc. with each purchase. Call it the frog-in-a-pot-of-boiling-water mentality.