The mouse with its touch sensitive surface is actually very good (much better than the little trackball on the mighty mouse) and has a nice weight and feel to it. The trackpad is excellent -- the larger size makes it better to use than the laptop equivalents, and I find its position to the side of the keyboard better as it doesn't get in the way when typing.
I'm actually using both the trackpad and mouse at the same time (as in they are both there, connected, and available), one to the left of the keyboard and one to the right. This works very well and is surprisingly natural (and no, I'm not especially ambidextrous). I'm still building muscle memory for this kind of workflow, but I'm already gravitating to the trackpad for light uses and quick movements (its faster to acquire) and grabbing the mouse only when I need to do something more precise or protracted. Sometimes it depends on which hand I'm using on the keyboard.
Even the chiclet keyboard is starting to grow on me, and I'm a pretty fussy typist. I've used and hated chiclet keyboards before, but for some reason this one feels better. I was going to keep my previous old Apple Extended keyboard, but its starting to look like that will go on sale with the old Mac.
I also bought the Apple charger & batteries, and got 8 batteries in the process (2 in trackpad, 2 in mouse, 2 in charger, 2 extra... did I just get lucky?).