Robert,
WinPC sign is very common and popular. The popularity comes from price, and also the ability to pay for monthly - direct from the company. At least it was once possible - to pay for it that way. It is also "full featured" with abilities that were only available with the "big boys" (CadLink, Scanvec, etc.)
I have tried it, and know many that own it.
I do not care for it, for only one reason. The controls (menus) are much different than what I am used to. I started wth Corel 2, and Signlab. (The same thing also keeps me from "mastering" Illustrator and Photohop). It takes a lot of time to master a software to get it to do what you want. Time is money.
It IS a good package and has been around for quite a few years. It will do everything you need for vinyl. I cannot say what it does for printing, but in reality, practice and learn Photoshop - you won't regret it.
If you have no vinyl software now - it is a very good alternative to the "big boys" - with available support.
Hope this helps,
George