One scientist, quoted in Science Daily notes:
With the idea for the adhesion now in place, there are a number of other mechanics that need addressing before the Spiderman suit can become a reality. Size-effects on the adhesion strength require further research. Moreover, man's muscles, for example, are different to those of a gecko. We would suffer great muscle fatigue if we tried to stick to a wall for many hours. However now that we are this step closer, it may not be long before we are seeing people climbing up the Empire State Building with nothing but sticky shoes and gloves to support them."
Isn't science wonderful?