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I purchased the computer case when I was upgrading my PC. I needed something that wasn't too big, wasn't too hard to build a PC in and that was affordable. When I was buying, it was very hard to find therefore I paid £40, now they can be had for around £35.
The case itself is a very basic cuboid shape with no fancy patterns. It does not have a window which you may want but I do not really mind. The case is black and sleek. The actual case is made from Aluminium, but the front piece is plastic. If you flex it is feels a bit flimsy but with normal use it should be fine.
The cooling capabilities are good and even better if you add some more fans. The case has 5 fan mounts. There are two 120mm on the front, one 120mm on the side, one 120mm on the back and a 140mm on the roof. Antec supplies both the top 140mm fan and the rear 120mm fan. The power supply is situated at the bottom of the case so these fans are sucking the warm air right off your motherboard. The top fan does have a tendency to vibrate against the thin roof panel but this can be fixed with a packet of £1 silicon fan screws. For such a cheap case it offers high end cooling potential.
The layout of the case is fairly standard other than that the PSU is located at the bottom. This is good as it lets Antec have a large fan on the top of the case but it may be a problem if your PSU has short cables. I had to stretch my CPU power connector over the motherboard; it is messy and possibly restricts airflow. The drive bays are orientated so there is clean passage for air to flow over the hard disks and into the case from the front fan mounts. There are only three 5.25 inch drive bays, but you are unlikely to need that many in a budget case. The drive bays lack and vibrations dampening or easy install gubbins which can be a bit of a problem if you have a loud drive like me.
Overall the Antec Three Hundred is a great case for only £40. It has great cooling and is reasonably quiet with its stock cooling. It may not have the flashy looks of some gaming cases but lights are not for everyone. For £35 at today's prices it is a great cheap computer case.