Two solid steering wheels of different colours. The wii controller (without nunchuck) has to be removed from the silicon housing to be used. This seems standard.
The wheel has an independent motion tilt switch (which you can hear rattle if you shake the empty wheel). When you put batteries in the wheel (yes, in addition to the Wii controller) the wheel will rumble and screech as you turn it: these can be turned off, and if you are playing a game like F1 2009 you will want to as otherwise both the Wii controller and the wheel are screeching and rumbling.
My only issue is that a genuine controller has to be inserted carefully: it's a snug fit as it needs to be for the controller to stay in place, but if you push the controller all the way into the recess (as you might imagine you do) the IR sensor is partially hidden by the wheel. Essentially, the hole for the IR sensor seems to be in the wrong place. This is easily remedied by easing the controller out of the wheel slightly to align the sensor with the hole. It still fits snugly, and doesn't stick out at all.
I don't have any other wheel to compare this to, but I don't regret this purchase.