Tulsi Tanti has been flying high but some signs of trouble seem to be appearing in his windmill empire. Some of Tanti's top clients are now not only complaining about the technical quality of his products, but also asking for damages of upto Rs 600 crore. Top notch clients of Suzlon like Edison International and John Deere are now seeking damages close to Rs 600 crore from the company for supplying defective windmill blades.