Yeah, sliders are fine if they are nice and sturdy. The OEM ones might be OK--just give them a good honest assessment. You don't want to become a projectile inside the car.
One thing to keep in mind is seatback bracing--while we don't require a fixed seatback brace, we do require something that will keep the seat from tipping rearward in an impact. On most cars, the harness bar serves that purpose--we like to see the harness bar about six inches max from the seatback.
If your range of drivers puts that distance at much more than six inches (with the shortest driver, with the seat moved all the way up), you may need to invest in an adjustable bolt-on brace like the one sold by I/O port.