He labeled himself as a severe stutterer in that video but on his first day video I see no severe stuttering at all. About McGuire, it helps many people out becoming a more controlled/eloquent speaker, however relapses are common and it requires a lifetime commitment for most. For only a small minority, usually people with minor stutters that struggle with anxiety, one course and the empowering feeling it gives is enough for lasting improvements. Are you will to put the potentially lifetime of work and effort in ?