I already asked here about your backend security
https://bitcointalk.org/index.php?topic=5227411 and people are still optimistic about closed source solutions
But i will ask once again anyway. Are you planning to make your wallet open source or at least do an audit?
Open source is not guaranteed to you anything. Are you going to check any release? Is anybody going to check any release of not so popular software? How you can prove that this code is really used to compile the program? Thats questions destroy the sense of open source. IT world is a world of trust. You always can use a paper wallet instead
I understand your point of view but open source at list gives hope that anybody will check project code base