Has anyone grown Proven Winners Show Off Forsythia for a few years? How tall does it get? Are you happy with it? I need to plant a hedge. I know there are some dwarf cultivars of Show Off forsythia but I don't want dwarf. I want the tallest out there so I'd like to hear from someone who's had these for at least a few years to see how tall they get. Info from real gardeners, not nurseries. Thanks!