nice program, but not for professional user

update #2:

Every update of this app provides better functionality, improved stability and lots of bug fixed, which is nice. It would be a 5 stars app if it supports "resuming" of interrupted transfers.
IMHO this app is still not a choice for users with huge files or unstable internet connections.

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update #1:

My first review on this app (below) was negative. But recent update resolved most of the issues. Now I can reliably transfer huge files (6+ GB) without freezing and it is now very stable.
BUT: It does not yet support resuming broken downloads, which is a big deal and I think every serious file transfer app should support this feature. I mean, come on, even command line tools like "wget" support this. This is a basic feature that most people need.

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The program looks very nice and is very easy to use. But after a few tries you will be annoyed by lack of some important features, especially support for resuming broken downloads. Resuming is a very basic feature that Trasmit and Cyberduck support, but it is not the case with Flow.
However if you are doing web development and dealing with small files, this program is recommended.

babakf79 about Flow