So the purpose of this forum is to learn about bit coin myself included, open up bit coin discussions , a place to go to ask for help , and to introduce you to circle. Now from personal experience I have used coinbase successfully and it has its pros and cons. It is not a bad bitcoin service except for it takes about 5 or so days to buy a bitcoin and a bank account must be linked.I do not have a credit card myself but there is a way to set up instant buy. In my experience my preferred bitcoin service is circle its quick (virtually instant) and a bitcoin can be purchased with a debt card. Here is an introduction to circle -With Circle, purchasing bitcoin is not necessary to use it. Allow me to explain:

All new customers begin with their account balance denominated in USD. Holding USD allows you to send funds to any bitcoin address as though it were bitcoin without your funds being subjected to the fluctuating price of bitcoin.

You can switch your account balance to BTC at anytime in the currency tab of your account setting, so long as you don't have any pending transactions. Keep in mind that holding BTC will subject your balance to the price volatility of bitcoin.

Either way, your account is all set up to linking a funding source and begin adding money to your account. Please let me know if you have any other questions.
Also you are at first limited in the amount you can buy this will increase over time and is reviewed on a rolling 7 day basis. To speed up the increase go under settings , account limits, there you will be able to request an increase.

Well I hope this helps member's, anything you have to add about coinbase mycellium coinkite or any other feel free to share. Also want to add this does have mod approval but lets use common sense here and not mess it up haha.. but all bitcoin talk is welcome