Current version: https://staply.co
Old version can be see here: http://web.archive.org/web/20141026193118/https://www.staply.co/landing
After the signup I don't feel comfortable to share files, even test files, with the founders. My inner fear is they'll message me while I just want to test out the product in private. It has the feeling of a shop clerk following my every move when I try a new product.
You may still want to add "
A better way to share files and links Turn them into one easy to read feed and always know who sent what and why"
P.S, your product is pretty much standard functionality that basecamp provides.
So if your goal is to have someone enter their email address, measure this and judge the pages from that and not opinion.
'What we like' and 'what works well' might be too different things. This sounds like a good case for A/B testing. Tools like optimizely.com make this very easy.