VG's are one of the best purchases I have ever made. Steve recommended them to me quite awhile ago.
They wrap on the bar quickly and easily, which is really important on deadlifts. They provide a big sense of stability and firmness with the grip. They are also way more durable than regular straps and will last you for many years. I have the Pro series, but I don't remember what the difference is. Could be load rating? I'd go with the Pro version for when you pull your 500.
It's pretty much a no brainer to go with them. I wish I had invented them.