I have a Gossen Luna Pro F and the 7/15 degree attachment which I use with my medium format TLR. For tripod work in daylight I usually use the 7 degree finder to grab a few quick readings of different areas. The rest of the time, I just use the default 30 degree reflective metering and sometimes incident. They all work well enough for me.
There are so many different light meters out there and I feel it takes a little time to get used to either one and learn it's quirks. I use a Soligor Spotsensor II and love it. It sure is not as convenient as a Pentax, but I still like it. It get's tricky to use in the dark though.