After some research i am inclined to use blockchain.info API and http://blockr.io API

So far the only problem of blockchain.info are delays, so I was thinking to run a perpetual loop and query txn from http://blockr.io API to track customer payments. Then when blockchain.info callback arrives finally this will be like a second confirmation

I don't want to run my own bitcoin server because people are getting hacked...

am i doing it right?
ideas anybody?