I looked at the Voigtlander VCII meter, but decided to go with the Gossen Digiflash in the end. The Digiflash was $169 a couple of years ago, and the VCII about $150. The versatility of the Digiflash won me over. It's been consistent across the board with my LunaPro F, but is much smaller and I am much more likely to carry and use it. I've taken to using the Digiflash in incident mode 95% of the time, and have used it for studio flash alongside the LunaPro F (it's less intimidating when you hold it up in front of a sitter's face). With rangefinders, when standing in the same light as my subject, I just hold the Digiflash over my head or shoulder, level and pointing 180 degrees from my subject, then use the reading. It's fast and easy. The EV readout is held on the display indefinitely, so if the light's changed, I can note the number, take a new reading, then adjust quickly to the relative change of exposure in thirds of stops.
The VCII does have the advantage with reflective readings of covering about a 90mm field of view on 35mm film, so you can use the 90mm frames of a rangefinder to closely approximate the reading area. That's harder to estimate with a handheld reflectance meter. But I've come to prefer an incident meter for most 35mm work over the 40 years I've been shooting, especially with rangefinders.
I used to have a "review" of the Digiflash here on APUG, but it may have gone away with a major software update. I haven't had a chance to try out the VCII firsthand. I think the Sekonic Ed mentions is a good alternative, less expensive than the Gossen Digiflash, but it's significantly larger than the VCII or the Digiflash/Digisix.
Lee