I've had them for 12 years (including predecessors). The early ones which were worryingly loud in high winds as they'd flutter their blades to limit their speed. The latest version is completely trouble free and pretty much silent, relying on electronic regulation to slow the blades down. I don't even turn it off in high winds any more. I'm off grid so I rely on it. I find some of the stuff above difficult to believe.

I bought an Air-X last year and installed it about a month later at about 30 feet height on a tower I designed and built. The Air-X started right up and then stopped. Many system checks revealed all was hooked up properly. I called the company I bought it from and tried to return it or get some assistance. I was told I was passed the return date and they could not help me. The Air-X became an expensive and a very high lawn ornament but nothing else. It provided no power to my off-the-grid, battery bank system. It sat on my tower fro months and did not spin. Another wind turbine I bought and installed on my property at a much lower height spins regularly and feeds my battery bank. I am very unhappy with this Air-X product and hope that some day there will be an aftermarket blade assembly and/or aftermarket parts to make this wind turbine of value. Right now it is useless.

I have had an air industrial for 5 years. It has survived the Orkney climate ok although I switch it off in high winds(the ability to switch it off without burning it out is a great feature). It does not really deliver the quoted power but is satisfactory. Being light it is easy to lower for inspection. It is better than the Rutland 910 I had before. Recently One of the blades broke. This was cause by corrosion on the hub cracking the blades at the fixing holes. This was my fault as The turbine had not been looked at for 5 years. Overall it has given good service and I would buy another.

Only good in steady strong wind. Noise it makes stalling in gale force winds can be heard a mile away - literaly. Two have failed, several times, by blade screws coming undone, jumping off its tower, breaking its casting. Probably OK if you don't have real violent winds.

http://www.scoraigwind.com/gipe/index.htm

This is piece of junk. I've had one installed in a high wind maritime area for the last year and a half. I don't believe it has functioned for more than two weeks in that time. I have sent it back twice to the for repairs under warranty and once the thing just blew off its slip rings. To be fair the company replaced it - the replacement doesn't work! Definitely a waste of money.

Do NOT buy one of these machines under any circumstances!!!!
They produce the most terrifying noise as wind approaches gale force - this is what the Blitzkrieg must have sounded like. They are totally unreliable - regulators, bearings (rotor and yaw), stators and blades constantly failing. The only time I got anywhere near the claimed 400w was in a steady wind of 28mph - lucky to get 100w at 15mph! This is the sort of rubbish product that gives renewables a bad name. I was so happy when I finally threw it away!!!! Only good thing I can think of is that 3-year warranty was honoured.