Finally, unless it's different than Roadster, regen braking is not anti-lock controlled. On Roadster, if you're in heavy regen and the rear wheels lose traction you'll lose all braking and the car will feel like it's lurching forward (even though it's only going into coasting).
Actually that coasting sensation is caused by the Roadster's traction control triggering while you're braking. Even while using the friction brakes the regenerative braking is providing a fair chunk of the deceleration force. When the traction control triggers it momentarily reduces the braking force and that feels like the car surges forwards.
On the other hand, if you're driving on a slick surface and you lift off the accelerator, the car decelerates smoothly using the traction control. So it has its pros and cons.