I have five mybook drives between three computers and they are fairly fast and reliable. In fact, the only one to go sour (my first mybook, probably due to a bad power supply which has been continually been upgraded throughout the line) only stopped writing (writes at between 1kb/s and 100kb/s if it's happy), still reads at full speed (25mb/s+). Nothing like my Seagate, which decided to kick the bucket for no reason at all, taking 320gb of data with it (all was backed up just a few weeks before)... And at least I abused the mybook before it died, exposing it to about 10 plane rides and a few accidental turnovers, the seagate was in a well ventilated desk with a UPS...
I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.
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