You know... I guess it should be clarified... that as far as your credit card information goes, as you can see by the responses you should feel quite secure...
As far as a more overarching take on "Is subscribing safe"...
Well, that's a whole other can of worms....  please fill out this questionnaire:
1.  Marital Status  __ Married   __ Single
2.  If married, how much does she love you (Scale of 1 - 10) ____
3.  If single, how long were you planning on staying that way?  ___ Centuries ___ Decades   ___ Years  ____ Months
4.  How much extra cash do you have on-hand for a new stick, rudder pedals, monitor, mini-fridge, field expedient bladder evacuation devices?  $ _____
5.  Are you prone to breaking things when angered?   ___ Yes   ___ No
6.  Does your job require you to be alert in the morning?  ___ Yes  ___ No
7.  Do you have plans for the first three Friday nights each month, around say 10PM CDT?  ___ Yes ___ No
These are just the basics, fire this up and someone will get back with you shortly.