I bought the Hawk's v3 helicoid adapter after reading the comparison at dcwatch:
Voigtlander VM-E Close Focus Adapter vs Hawks factory
Adapters are good, but there might be some misalignment esp after some use with close up helicoid adapters compared to the native mount lenses. Hawk's is the one started the helicoid adapters and they had ver 4 last time I saw. I don't know how Hawk compares to Voigtlander in quality/long term use.