Generally you will always find some people with negative things to say about an organisaton, and some may have a valid point. You will certainly find that from a few posters on here and what has gone on between them and Hields seems to be a two way street and is their business I suppose, only the people concerned will know what happened.
My only experience of Hields was when Bob (having never met me) at almost no notice hired us a jetranger to complete a corporate job when our original aircraft went tech about 10 miles down the road. It couldn't have worked any better.
I was on a course with him a short while ago this year, and from my experience of him there I would have no hesitation in recommending them.
Like Whirly says go and see them if you don't like them then you don't have to fly there.
GS