There are a lot of bad apples on the internet and it is understandable that a translator may have concerns about payment after working on a project for a longer period of time, delivering it, and then hoping for payment some 30 days later.
The best way we can think of assuring you of our reliability is by the opinion of our translators, and the best site we know of where translators can express their opinions is on ProZ's Blue Board. Our account with them is here, but since you may need to have credit with them to view this forum, we have copied screen shots of the forum below. 5 is the best mark and 1 is the worst.