Fallfrombrace ... ceramic braces are only slightly larger and are the same height of the tooth. They are smoother and more comfortable due to their finish. Also with them being slightly larger, this allows the spread of any discomfort felt by the cheeks ... again a comfort thing. Ceramic braces DO NOT stain ... and will not stain. Ceramic is not a material that can stain. Ceramic is very hard and this is a reason that many orthodontists will not put them on the lower arches, as they can damage your upper teeth if they come in contact with them.
Tyrael ... modern ceramic brackets do not break in half, they go on and come off the same as stainless steel brackets. I agree that ceramic brackets do show off the coloured ligs much better than the stainless ones, as they're translucent, whereas the stainless colour detracts from the ligs by dulling it.
Diamonds are more expensive when it comes to jewellery ... and some ceramics look like diamonds ... so clear will look more like jewelry than stainless stell every will!