Went in late March '11, it's lovely, be warned, it was freezing! The tour guide was informative with a good sense of humour. The full tour seemed too long for us but so glad we included this in our trip, well worth it!
What's to say, if you get to see them the reviews I'm sure would be great. We got to see a faint ribbon, but it wasn't classed as seeing them though. If you want photos make sure your camera can be set a slower shutter speed (20-30secs). We could see them better on the photos than to our eye.
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