As the title of my review explains, this is a great rock album.  Anyone who loves hard rock music needs to get this album.  Even the ballads, such as the title track and the powerful "Prayer" are not the syrupy sweet tunes some Christian rock bands put on their albums just to get some airplay on Christian music stations.  Instead they are well-crafted, well-performed softer songs, and with John Schlitt on vocals, you know there will be some power behind the vocals.  Armed and Dangerous, Last Daze and Underground just rock, and there is plenty of strong guitarwork as well as the signature keyboards that have been around on every Petra album ever made, but which have had an extra zest to them since the Elefante brothers started producing.  Petra does not waltz around their message like some other modern "Christian" rock bands, so expect no holds barred on the lyrics, as always.  All in all, possibly the greatest Christian rock album of all time and one of the best rock albums, period.