I do something similar, but I use a
Pump-N-Seal, which is designed to use relatively wide-mouth jars rather than wine bottles. I generally use Snapple and similar drink bottles in sizes ranging from about 300ml to 1l. I noticed a marked reduction in the rate at which developers go dark during storage after I began using this system. At a guess, I'd say it roughly doubles the useful life of developers.
One caveat with the Pump-N-Seal, which may not apply to the VacuVin: The caps eventually stop sealing well, I believe because the rubber becomes brittle. I therefore need to replace the caps periodically. This isn't a big deal, but it does add to the consumable cost -- I've got to go buy another bottle of Snapple (or whatever) and use one of the tabs that came with the Pump-N-Seal.