I have had a Pentax digital spot meter for 9 years. It's been dropped more time s than I care to remember. "Takes a lickin' an' keeps on tickin'" or whatever.

The analog meter uses a galvenometer. It is more susceptable to drift over time and is also somewhat more delicate. If you use your equipment out of doors, I' d go with a digital meter.

You might also consider the new Sekonic 508(?). It incorporates both a spot and an incident meter in a weather-resistant body.

Good luck!