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Another good reason to use BT is its block checksums. Does everyone really expect to get a clean download of 3-4 GB? With BT, it'll detect that bad block and re-download just that *one* block, not the whole file.
They could at least provide md5sum, that you can test if you have whole file with all chunks. On iso-hunt there is some file similary named and the dovnload is much faster.
P.S.: I think it is OK to say that because beta is free to download.