Let me tell you my sad little story with a happy end.
I had Sony Xperia S for 3 years. Before that, I had a crappy Samsung that was barely even a smartphone. Xperia was my first smartphone and I was thrilled to have it. For the time when it came out, it was pretty good. However, as it happens with all Androids at some point, it started lagging after a few months as apps got more demanding. I wanted to use Snapchat, Whatsapp, tons of different apps at the same time just because, but it would never let me. I had to factory reset it every few months because it would get so slow that it'd take me ages to go into the camera, or any other app. So, I started doing online jobs (I'm still a student), I collected money and got myself a brand new iPhone SE.
Long story short, I'm totally in love with this phone, it's so fast, the battery is amazing and I can do anything that I want on it without ever experiencing any issues (so far). So, yeah, that's my unnecessarily long sob story. I'm just happy I got a brand new awesome phone, is all.