This is so useful. I noticed their flexibility options are the usual +/- n days, but it would be more useful for me if there was an option to only + or - but not both. For example, let's say you want to leave on the 7th, but the 8th and 9th are doable, just less ideal because you'll have one or two days fewer to spend at your destination. With the current system you'd have to choose the 8th and then say +/- 1, which screws you over if the finders try their hardest to get the exact day you requested.

I just discovered you need to pay the finder's fee in advance. While this might get more finders to use the site because they won't be afraid of their efforts going to waste, this is going to deter a lot of customers who are still shopping around and only want to fly if they can get a better rate than they expected.