The sound is great but they are bottomed out easily if too much gain is turned up at the amp. They could probably use a partition or something to make the space they are in smaller.
My system had six 6 1/2 Kicker speakers. I just got done replacing them all with Wet Sounds REVO 6 XS. I only had one that was hard to remove the grill. It was like the gasket between the grill and vinyl had melted. I just had to give it a good tug and it started peeling away from the vinyl.