As one of the first products released for the new Savage Worlds Adventure Edition (SWADE) rules, Crystal Heart gave a new spin to the feel of superheroes and postapocalypse. It looks and almost plays like fantasy, but, it has the tech from the Bygone Era to make it feel almost like Steampunk. So, as you can see, it's kind of a difficult game to classify. But, that's part of what makes it so much fun. Aviv and Eran created a great Web comic at uptofourplayers.com. The fact that they decided that, in the conceit of the comic, their friends happened to be using Savage Worlds as the system for their Crystal Heart game setting made introducing new players to the system so much easier.
Then, as they were writing it, SWADE was announced and they immediately shifted gears to make their new setting book for the new rules. This was then followed up by the characters in the comic upgrading to the new SWADE rules. The comic is, of course, still a great way to introduce new players to the system, possibly the best one for it. I tell all my new players to read it. I refer my seasoned players back to it.
And having played the setting with a group of guy friends from work for almost six months, albeit in pre-written adventures (of which there are enough to keep a game group going for about a year or so of weekly play for an hour, especially if you use the pre-release adventure) are enough to last for quite a while.
I would recommend this setting for any age and for any group. It can incorporate the sporadic play-style of children, the trying-to-be-adult style of teens, and adults who want to, sort of, play superheroes. I love the unique spin on the Powers and using only portions of them according to the disposition the crystal, slotted in your hero's chest. It makes you a superhero who can swap florbos crystal and get a different set of superpowers. It is one of the most fun settings, and one of the best setting books out there. Buy it and all its supplementary books too.