IMHO, if you want a drive that you can throw files on and then take them off onto another computer, go with USB. Firewire may be great, but I know in my personal experience USB is much more available. For example none of the computers we had at University had firewire, none of the computers where I work have firewire, and very few of the computers I have worked with on my own time have firewire, yet 99% of them have had USB. I use 4 USB drives with WinXP MCE 2005, so far I have never run into a problem with them. I use them to host my FTP server/Store PVR files/store my nightly backup.
You mentioned that you wanted to use the drive with a laptop, from what I found on the net the drive comes with an AC adapter, meaning I assume that it's not BUS powered. This is going to be a pain if you plan on carting the thing around. You might want to look into a 2.5" laptop drive and then purchase a bus powered external case. I have one where I bought a 40GB 2.5" HDD and a bus powered case, the thing only measures 3.5"x2"x0.5", since it's bus powered I can use it with any computer that has USB ports, and it's easy to carry around, although something like this would probably cost more.
If you looking for a drive that is just going to sit at home then the one you have linked to above would probably be great, if your looking for something portable that you can use with other computers then look at possbily buying a laptop drive with a bus powered case, and make sure it's either USB or firewire/USB combo .