Have surpassed the one month time to buy Apple care + for iPad. Should I now, not buy Apple care for iPad ?

I don't own a 3 so I'm not up on the rules on purchasing regular apple care, if you can for the 3 and if the rules that applied to my 2 apply to the 3. Namely that I could purchase Apple Care anytime within a year of the purchase of my iPad.

You may want to read and see what you're eligible for. As to whether or not...it's a personal decision. I originally didn't. I bought mine at Best Buy and, of course, had them pushing their black tie service at me and I turned down all their 'extras'. However after a month I had issues with the port on the bottom of my iPad. My port went bad and I was unable to charge and sync it. I took it back to Best Buy and they exchanged it for a new one. I then chose to lay out the money for the extra year due to my experience with one faulty device.

But I know others that never purchased the warranty and have never needed it. So it is very much a matter of personal preference.

You could buy the original AppleCare plan, the one which did not include accidental-damage coverage, any time during the original warranty period. Apple no longer sells that plan, though, only the AppleCare+ plan which includes damage coverage. You must indeed buy AppleCare+ at the time you purchase the iPad or within 30 days of purchase.

Regards.