I'm no F1 expert, but I can say the SP-1 has a good amount of "adjustable" mechanical grip. That be it, chassis flex, suspension arm flex,ect... I was thoroughly impressed with it's ability to carve, hug, and hold the corners with ease. My previous chassis YRF-001 (which I still own) struggles quite a bit in this department. Sometimes it's quite a handful to drive, especially placing it and holding it into the corners.
Over the past weekend, I managed to get the SP-1 on my local track. The kit setup is really good (for foam) which I run. I was out pacing and out cornering TRG114's, Kyosho, and Tamiya chassis. On it first run! Not bad.
If I were you I would try out the SP-1. Don't let the price fool you