I use a spot meter for LF and an incident meter for MF and most everything else. I enjoy using a spot meter, but I guess my boring point is that a far more useful thing is familiarity with your own processes. I tend to use the same films/filters/meter combinations over and over and over and by now get quite consistent results. For landscapes, I reckon you have the time to contemplate the good info that a spot meter gives you - 'why not' get one and see if it works for you? You can always sell it here if not :-) I've used a Minolta F (nice and simple), and now a Sekonic 758DR (it can do incident readings & trigger my pocket wizards for studio stuff), and they are both great, accurate meters.

Marc!