Mine was pretty full on - it was a failed security dog. I did a lot of mondioring with him and he did need to be busy and doing things. He was not a dog to relax after a dog walk 
He was more energetic and needed more stimulation than my collies - I also found that the stimulation had to be specific - He was a great agility dog getting to grade 7 in one season but he preferred mondioring or mantrailing.
He was not as resilient as some dogs and did need his environment managed so he felt comfortable.
Great dogs if you have a lot of time, energy and like having a dog more intelligent than you!