At shows, the gear that sounds vivid and exciting can make more neutral stuff seem blah. But, their is the danger that the attention grabbing stuff will become tiring in the long run. The Parker Trio's did not have immediate, attention grabbing sound, and the person doing the demonstration kept volume at modest levels. But, I suspect it will sound good in the long run. There are plenty of speakers that deliver more obvious bass slam, and that may suit rock music, so this is something you will have to judge for yourself. I think it has adequate bass extension, but, I am not a bass freak.
I like speakers that sound lively and dynamic when playing at lower volume levels. That is why I prefer high efficiency, horn-based systems, and certain other systems built around wide-range drivers. Many modern systems sort of "fake" the kind of dynamics horn systems deliver with such ease by having a tipped up frequency response, thin midbass, and by having a false "edge" to the initial attack to a note that makes them sound fast. But, that leads to sibilance and a harsh sound. I did not find the Parkers to be unduly harsh sounding. Did they have the kind of easy, relaxed sound while still being dynamic and "fast" like a good horn system? Not quite, but much closer than most systems. On the plus side, they lacked the kind of coloration that attends most horn systems (no nasal or shouty quality). They were, to me a good, albeit somewhat pricey system.