The "+": A large housing with space and power connectors needed to add 2 additional hard drive, a multi-card reader and my old DVD burner and more. 4G RAM is a single barrette, it leaves a free memory slot if needed.
Bit noisy in operation, a lateral ventilation cleverly placed opposite the fan processor must allow to effectively evacuate a part of the heat. Easy opening without screwdriver is well thought out.
Two USB connectors on the front panel USB2.0 + 4 behind, it is not huge but enough for my needs.
The completion of the installation of Windows7 is carefree in less than half hour with only 1 reboot; it's comfortable, and Windows 7 is really fast and pleasant to use.
The "-":
Red light running really VERY bright disk,
No slip pads under the case,
No USB 2.0 port on the front, damage,
No built-in HP (or not working), it is mandatory to connect mini speakers for sound.