"The pros are: it is much less messy-looking than your typical tank - all the filtration equipment is built in to the hood. It also comes with a cord organizer which attaches to the back corner of the tank, which adds to the overall clean look. Additionally, it is acrylic, which is very durable (though you can still scratch it).
The cons are: if you plan on keeping tropical fish in it (and I wouldn't really recommend keeping goldfish in here - they'll grow out of this 6 gallon), you will have to buy a heater, since it is not already built in to the system. Secondly, the way the hood is set up makes it difficult to feed without dumping some flakes into the filter itself. Additionally, for any aquarium maintenance you will have to take off the full hood, which is slightly annoying (but only enough for me to knock off one star).
Buy it, it's a great value and very cute to boot. However, if you have more space available, you might just want to upgrade to a bigger tank. For a few extra dollars, you can get the standard 10-gallon glass starter tank (not as attractive, but more gallons = more fish!). If not, you'll still be satisfied with this tank!"