Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: A Must for Perfect Dark

First things first, if you are thinking of purchasing the expansion pack, do not buy a third party pack. You can read all of the other reviews about systems that were fried by third party packs. The third party pack has a red top that looks like a grill. The legit pack also has a red top, but it is flat and has little dimples that resemble a golf ball. Installation is easy. I found several different videos on [...] that show the process. The pack itself is a must if you wish to play Perfect Dark. It allows for you to play solo missions, which is not an option without the pack. This is the main reason I purchased the pack, so I can't speak for other games. Hope this helped.