I'm with Jormax too. Ours are used around 100 days/year in Spain and 40 days/year in France and have been for around 7 years. They have never been guyed - occasionally the end pole has been strapped to some suitable upright on the pitch but no regularly. High winds which have scatted sat dishes across the campsite, destroyed airtube awnings etc have only loosened the posts a bit, needing pulling upright and a good whack with a lump hammer. Take a bit of getting used to to get the 'fabric' (plastic) flat without creases, not tried on concrete but fine on CCs site hardstandings, Spanish and French hard pitches and a doddle on grass.