I've read some reviews where people say "slim notebook profile" or something like that. So that basically means they keys are small and close together right? I don't know why people talk about it as if it's a good thing
Slim profile means that the keyboard is thin. I still prefer low-profile notebook-style keyboards, and the Logitech Illuminated is still one of my better keyboards, although I tend to rotate between a lot (one of the reasons I think I've skirted around RSI) of different ones.
But there's a lot of difference in feel between different laptop-style keyboards. Once again, I think the Logi gets the break and landing feel as perfect as I've felt in that class of keyboard - the only problem is that the baseboard isn't as stiff as I'd like, so there's some 'bouncing' felt during fast typing. On the other hand for example, the Apples have a solid baseboard and is similarly low-profile (actually slightly more so at least at the front), but the key feel is one of the most godawful actions I've had as far as scissor-action is concerned.
Mechanical keyboards like the Filco's put the hand in a certain position due to their height, and I don't find it the most comfortable position especially when going from one of the low-profile notebook style keyboards. Sure you can type fast on one, but I'm not as hung up on their (or generally any mechanical) absolute superiority as some. And when going mechanical, I have to say I prefer the clickless brown switches to the clicky blues - but this is a personal preference according to your expectations (and the noise you're willing to tolerate from a keyboard).