I'm like you Dean, I go through those same trends, but learned to like each for different reasons. So here's my thoughts on their pieces.
Solaris was a flippy ball for me. Enjoyed it somewhat.
Requiem is a beast, and great on the sport patterns and tournament shots. I could really open up the lanes with it. Loved that ball.
Aftermath is a very strong angular ball, and I ran into alot of over/under with it, but still enjoyed throwing it though.
Aftermath Pearl is a sneaky ball. Real poppy off the dry, and in sanded form is a very strong pearl. Still enjoying throwing it.
Epicenter is a very versatile piece imho. It was definitely a godsend on the longer patterns with some surface on it. Still had good length and a strong move.
The Euphoria is one of my favorite pieces. Next to the Villain Pearl, the Euphoria is second in how smooth it was for me. Very consistent piece and I got alot of play out of that ball during the summer.
But right now, the Raging Bull Charged is my favorite piece by Seismic. Another strong but smooth rolling piece. Very predictable and consistent move to the pocket. Not as strong as the AMF Grip(best ball out imho), but just below it and just as smooth. I love that it makes people ask what ball I'm throwing, and when I say "Seismic Raging Bull Charged", they are baffled and amazed at the same time.
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Don't worry the zombies are looking for brains, you're safe.....