- My wireless keyboard does get dirty, but it is easily wipe-able. Gets rid of the dirt using a damp cloth.
- My MacBook Pro keyboard is prone to dirt underneath too - especially where the spacebar is. I had a biscuit crumb under there for ages before I realised what was causing my spacebar to click.
- I've never used key covers, unless you mean the actual style of the keys?
- Loader than the MBP keys? You mean longer? Yes, took me a while to get used to, but once I was used to it, I really preferred it.
- The little grove in the MBP keyboard is nice, and it would be nice if Apple included a slight one in the new keyboards.