Not in the "Phone" department it's not I'm afraid.

The best way to judge is....think about what you do with your contacts and sms everyday. Don't leave out the little things cause those are what you'll notice are missing.

For instance, to search for a contact on My E75. I just begin typing the name and it'll show up. On the n900, you cannot do this from soft on screen buttons within the Phone app. You only get a quick slider there. The only way to do this on the n900 is to slide out the keyboard and type outside the Phone app, this will take you to your contacts and from there you pick and call. The simple speedy function becomes a two handed ordeal. Not really a big issue. But it's those little things that you'll notice, so I wanted to give an example.