Thanks for your response. We're thinking of getting one - we have an awkward situation where we want to put the fire across a corner (first creating a "false" wall. The former owner of our property ripped out every fireplace and inserted windows where the fireplace had been :( Didn't like the idea of glass with a balanced flue fire - think we might was well get an electric fire as it looks the same!
fan flue/power flues do tend to be noisy. some are worst than others, balanced flue is the way most people go these days. Even if they have a chimney 70% of my customers opt for glass fronted because of the efficiency.