What can't I say about King's Quest? I was near about raised on adventure games, and this was a big one. I didn't really appreciate it as much as a kid as I have on my recent replayings of the series. The one thing I will mention in regards to this collection, though, is that there are bugs that occur because this game was not built for newer systems. You can find the patches for it at http://www.sierrahelp.com/Patches-Updates/Patches-Updates-Games/KingsQuestUpdates.html
. Alternatively, you can purchase the collection from GOG.com. They have it split into three sections, 1-3, 4-6, and 7-8, and 8 isn't included in this collection. I have yet to determine if this is a good or bad thing.
I'll also mention that AGDI made a wonderful remake for the original King's Quest to give it icons like KQV and KQVI had, and they did a big storyline overhaul for KQII that even included the original voice actor for Graham. They also did an update to KQIII with a little bit more story to it, as well as the icons. You can find them at http://www.agdinteractive.com/