I picked up a Volcano a few years ago and it is a lot of fun. It has some neat features and a fast machine for a widebody. Everyone that plays it enjoys it. Have that sitting next to my Haunted House.
The other is a recent addition. Picked up a Motordome that when the head was removed all the wires were cut between the head and body. After a few evenings of soldering (and a lot of heat shrink) got it all back together and finished repairs. I wasn't expecting much based on reading reviews and YouTube videos but it is a lot better than I expected. This machine seems to get slammed in reviews for the sound. It's weird but it sounds better in person than on YouTube and it does fit with the theme. If someone really doesn't care for the background sound they can turn it off. One of those games that people either love or hate.