download accelerator's

these seem to be to good to be true. Whats the catch? decrease in quality of the downloaded file?

 

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The download managers (DM) I've seen work by breaking the file into parts and starting multiple downloads at the same time. This will result in a faster download if the site has a cap on speed that is slower then your connection. For sites that can match your top speed there is no benefit. Occasionally downloads will fail using a DM - for some reason the process of assembling the file from parts doesn't work, but I've had pretty good luck with them.

 

The only download manager I use is the one built into Opera.In the past I've tried the likes of DAP and found the promised speed increase to be highly exaggerated.

 

The free DMs Orbit and FDM work pretty good ,so does DTA extension in FF.