MJ, Multi-spot just provides an all new way of metering. For B&W work, I find it to be the ultimate meter--in manual mode, I spot-meter some highlights, some shadows and mid-tones. As I adjust the shutter-speed and aperture, the dots move around on the scale. There are pip-marks for +/- 1 stop, 2 stop and 3 stop--and depending on whether or not it's an OM-4 or 4T(i), four stops. If you know your film's usable exposure latitude is 6 stops, you just make sure all the dots are within the +/- 3 stop marks. If you want that shadow to go black, just adjust exposure so that particular dot is down enough pips.
Another feature, which I never used till this past winter is the highlight/shadow buttons. Let's say it's a snowscape--just spot meter the snow which you want just the slightest detail in and press the highlight button. That's it.
Probably the biggest reason to pick up an OM-3(Ti) or OM-4(Ti) body or even the OM-2S is because all meter sensors are located in the mirror chamber. Therefore, you can upgrade to the 2-series focus screens without throwing the metering off.
But from a pure sensory addiction perspective, the OM-2n is one of the two finest handling OMs made.