Never shot a CS1 but the Insight is ridiculous. Very fast, efficient, and very smooth. I was easily putting 5 or 6 balls down range without even realizing it. It's small, fast, and a very competitive shooter.
The Insight I used was my brothers. The only time anything happened to it is when he tried to adjust something. Had to send it to BL (Blast?) or whomever does their stuff to get reset.
If you go with the Insight send it in, get tuned, then never touch the settings again, except what it tells you to do to adjust velocity. It just works.
They are both very good guns, so it'l really just be your preference.
I like Spyders.
MR1, MR2 LP, EMR5 LP, EM-1, Raven Primal, Victor, Fenix.
Magfed Hurricane with T15 Mags