are their any springs in the back of the guitar because i know that they have a spin knob thing for adjustments and are the S series guitars and the ZR trems any good because i love the look of the new s320 but dont I dont know if this guitar will be any good
ZR's have springs in the back just like any locking trem guitar. The wheel thing in the back is to easily adjust the spring tension instead of having to pull the back cavity cover off to adjust the mounting screws. I've been told they are excellent trems and you can bend without the other strings bending as well...
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I have a 520ex with the ZR, and love it. The tunings rock solid, and they are a breeze to set up. They have a tool in the tremolo itself for intonation adjustment.