The GMC AVC-S7 is a rather expensive but interesting product that represents an original platform for building an HTPC. Its exterior is all right and its chassis is good overall. It is slim and disguises as an ordinary DVD player. It has an integrated display with appropriate software support, can be operated with a remote control or buttons, and comes with a slot-loaded optical drive. These are all hefty arguments in favor of it.
Alas, the use of outdated components and a very noisy power supply are a serious downside. The power supply just calls for replacement as such a high level of noise is unacceptable for an HTPC. The AVC-S7 might be viewed as a platform for enthusiasts to experiment with but it is too expensive for that. Paying so much money, you want to get a modern product that does not need any manual improvements.