Buyers should be aware that HP used the same model number (8300) for four different models: a full tower, a small tower, a small form factor desktop and and ultra-slim desktop. This review is of the small form factor model.The computer was thoroughly cleaned - almost like new - both inside and out. It is very quiet (though not silent) and cool in operation.Little information is given about expansion opportunities, so I will mention a few:The computer comes with an internal hard disk drive, and a CD/DVD player/recorder installed. There is an empty 3.5" drive bay, with a power connection for an additional drive, and there are two unused SATA drive connections available.There are both PCI and PCI express slots on the motherboard.The computer has a DisplayPort connector on the back, but no HDMI connector. If you have an HDMI monitor you will have to purchase an HDMI to DisplayPort adapter (about $8 on Amazon)All in all, I am very pleased with my purchase.