Wellllll, I use both the Pentax Digital Spot and the Sekoinic L-778 (also a 718 in the studio for incident metering). It is a real toss-up getween the twometers. I do like the abilities o fthe L 778 to aid in doing zone work with the three tirangles, I also like the 778's ability to work as a spot flashmeter, and every once in a while the variable 3 degree/1 degree spot is nice. Having said iall that the Pentax Digital is one of those truly elegant do one thing and do it better than anybody else sort of tools. It fits well in the hand, it is compact, it has a nice bright red led readout in the window. You just hold it up to your eye and sweep it across the scene watching the readings change and then do the calcs in your head.
If, OTOH, you get really complex about your Zone calculations then theire are other meters that may be easier to use ... any of the SEkonics or Minolta spots. Finally, if you don't mind BIG and I really mean BIG, then the Gossen UltraSpot II is the hands down winner for sophisticated operation.
Finally, My Pentax Digital Spot is at least 10 years old (maybe older...I can't remember) and it has definitly been through it all and taken it. Never had to havce it serviced, i tjust keeps tickin ... oh yeah the Pentax and the Sekonic remain within 1/3 stop of each other whenever I check them.