I had a play with one today in my local shop. I am shockingly out of practice of hand holding a telelphoto! Even with a borrowed monopod shots were blurred, however there were 2 which showed the potential this lens could have, I would have asked to take it outside, but it was so wet and gloomy I was better off inside pointing it at a camera display cabinet.
I feel with another play and more thought of settings it would perform much better and convince me to pull the trigger on it. It may be I will have to use a tripod with it rather than a monopod.