Does it become a problem? No, well not one that will stop the computer from working.
Will it effect battery life? Yes, of course it will, but not by a 'HUGE' amount.
Will it run hotter? Yes, more speed = more friction = more heat.
BUT!
Will it be worth it? Yes, if this would be your main computer, and not just a mobile workstation. You'll notice a speed difference with most disk activity heavy tasks (duh)... not by all that much, but with laptops even a small improvement is a good one.
Personally, if disc access is important for you for jobs like large media editing (video, sound, audio, etc..) and you need the mobility... just buy an external firewire drive. Better cost per megabyte, better seek time, more overall storage and much faster transfer rates.
no sig, how's that for being a rebel!
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