I hope you realize you are accepting full risk for all your users' money by using Helloblock. You have a team of 5, is it really too much work to run your own node?
We know the guys at Helloblock and we're very excited to be working with them. We feel that a healthy ecosystem of Bitcoin web services is beneficial to everyone. That way everyone can focus on their strengths. Our strengths are in making and shipping consumer Internet software.