I use the SP-2 at home exclusively, with the Casio PX-5S digital stage piano I bought it for. For this reason, I didn't require half-pedaling support.
Nice spring tension in the pedal. The shape of the pedal itself is nice and the chassis stays put even on less grippy floors.
I had two issues with it. The spring started scratching against the chassis very soon but many users before me have found ways around it, like bike lubricant.
Secondly, at some point, the pedal wasn't sending sustain messages properly until I switched the polarity and rebooted the piano. All is still well, especially for something at this price and gets used so much.