My previous phone, a Sony Z5 Compact, was sadly one of the worse phone experiences I ever had, software wise. I used it for 4 years and in the end it was sooo slow that was unbearable (maybe the internal storage degraded?). Battery life was great thou, 2 whole days when I bought it and in the end it was about 30 hours but after 4 years it was better then newer, just unpacked phones.