For the ZX-5, the SP and FS versions are like night and day.
There is even an FS2 version to compare against to as well. To me, no matter how great the SP's price was, it aint worth it.
For the RB5, the main difference between SP and SP2 is mainly the motor centering kit for brushless motors. Some felt there is little difference between the 2, so if the SP's kit price is very good, you should grab it.
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