I just received a Matias Laptop Pro today. I really like it. For me the layout is great, which is basically an Apple BT with a forward delete, pg-up and pg-dn keys. I prefer a ten-keyless.
I like the way it sounds and feels. The feel is smooth, with a small audible & tactile cue. My muscle memory caught on in about an hour. Only the arrow keys have given me a little trouble. I wish they were a little separated from the rest of the keys, but I am sure I will adjust.
The battery is huge, which makes it physically heavy. For me that is a double bonus, giving it a long battery life (supposedly 6 months to a year) plus a dense overbuilt feel. It doesn't slide around the desk at all.
Consider I haven't had a mechanical keyboard since 96-97 when a broken water pipe killed my Model M (that is a story) so I might just be excited about the general advantages of mech. keyboards. But, I give the new matias a whole hearted recommendation.