I visited Naxos after reading reviews that the wind was really constant and strong. I wasnt Disappointed! For a kitesurfing holiday it was perfect. I found a centre in Mikri Vigla, a small town located about 12km from the capital, Chora. I was pleasantly surprised by how nice the beach was and how helpful the people were at Flisvos Kitecentre (www.flisvos-kitecentre.com). I decided not to bring my own kit with me because of the price of carriage on flights and the risk of it being damaged. Flisvos have an excellent selection of kit for rental, using Best kites and RRD boards, and I found the rental price to be pretty decent. The staff at the centre are more than happy to help and they always have a forecast up in the bar so you can see what youre expecting weather wise!
I had a week of wind where it didnt drop below 20 knots once! The wind at this spot is nearly always guaranteed!