Installed it, and it seems to be running fine. Not so many worries about security as with Wordpress, kind of a relief in a way.
The one potential resource thing at some point is that when you publish/republish the pages, it needs CPU (obviously), but that's just during that time when it's doing its thing -- with just a few pages/posts the process took between 2-5 seconds but obviously the time it takes is going to increase as the content increases. With lots of content, republishing the site might take up some CPU for a longer period of time, but again, that depends on the amount of content. If I'm not mistaken, it's probably not something that would need to be done very often, you'd just publish the new pages, not republish the whole site. This would be an area where Cloud Linux, for instance, would be really cool -- it's not that it's a process that takes forever, it just needs CPU to do it once, and then it's done, so throttling it would be absolutely no problem. Also, if you've got a powerful CPU doing it, it won't take as long. It's the one thing I'm paying attention to. It tells you how long it took to do it when it does it, so it's an easy thing to pay attention to.
I'm seeing more shared environments that have used it successfully, so it's probably going to be OK.