Saucony ProGrid Guide 4 is one of my favorite shoes. The upper has a generous amount of mesh which improves airflow, lightness and comfort. Mesh is also helpful if you have bunions or hammertoes.
The rearfoot midsole is thick providing maximum cushioning at heel strike and the firm medial EVA (grey) helps resist pronation and improves stability.
The width is not too narrow and not too wide. This image compares Asics 2160 to Saucony ProGrid Guide 4. Notice how the Guide 4 outsole is slightly wider in the forefoot than the 2160? This is a great feature as most feet are slightly wider in the forefoot than rearfoot.
All in all, Saucony ProGrid Guide 4 is a great shoe and I also like the new bright colors.