Is the A55 worth it?

I'm looking to upgrade from the A22 on a £300 budget ($375), I think the A55 looks the best fit for what I want (good battery, camera, and display) but will the difference be actually noticeable?

Also would anyone recommend anything else, the main thing really putting me off the A55 is how big it is.

Btw I'll be buying the phone refurbished to save money.