Any experiences with USB powered external harddrives?!?

Hello, I have just bought an external case that an internal 2.5" hard drive can be installed inside it. I have not received it yet. It has no power supply since it's powered by USB. Does anyone have any experience with this, or with USB powered external drives?! Would there be any speed/power... show more Hello,

I have just bought an external case that an internal 2.5" hard drive can be installed inside it. I have not received it yet. It has no power supply since it's powered by USB. Does anyone have any experience with this, or with USB powered external drives?! Would there be any speed/power issues?!

I am thinking of monitoring a Hitachi 320 GB drive inside it and use it with a HP laptop.

Thanks in advance.
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