Buy SONY Laptop VAIO Z Series VPCZGX/S Intel Core i5 1st Gen M ( GHz) 6 GB Memory GB SSD NVIDIA GeForce GT M + Intel HD. Sony offers up an expensive ultraportable for business users with astounding battery life. But is it worth the money? Read on to find out! No question, there is lots to love about Sony's Z-Series Vaio, model VPCZGX/B. Performance is blazing, nearly at the top of the charts and.