I've never heard of it, but after reading the website I can easily tell you what I think about it.
This school is basically selling courses to give you the basic info on what it takes to get different types of government jobs. It covers a lot of basics, like what government agencies look for, what test are required, etc. The classes on writing resumes for government positions and other ways to present yourself properly for those type of jobs may be quite helpful (but there's no way to know how helpful).
This school is NOT accredited. It is not a degree program of any type. It is an education on how to look for a job, but it is not a substitute for higher education. If you want to apply for a government job that requires a bachelor or associates degree, this program will not help you in any way. The classes on math and other academics are a joke. The classes on law enforcement, driving techniques, etc, are probably an okay source of entry level knowledge, but are no substitute for a real background in the subjects.
I can see this school as being valuable to people with little to no education who want to start with a government career but have no idea where to start. It may help if you are looking to get a job that has a certification requirement but not a degree requirement (like a USPS job, or police job in some rural areas). It could also be a useful launching point to help you determine what type of higher education would be best to pursue. But I would place the value of this education below the value of an associates degree.
Also, it's worth nothing that the two addresses listed are buildings that provide "virtual" offices, meaning they keep and address and a phone number, but there may not be anyone from VVI physically located there. It's also possible that VVI has a small office there, but either way they own no real estate. This isn't necessarily bad (ITT, for example operates out of a similar type of office in downtown Philadelphia), but does mean they have a lower investment/overhead point that a school with a physical location (read: it's easier for them to declare bankruptcy and disappear).
So, this school may be worthwhile if you need help finding direction, if it's cheap, and doesn't take too much time. If you already know what career path you want, or if it's cost (in money and time) are similar to what you would put into a local community college for an associates degree, stay away.