I recently bought ACER Liquid Z530 which comes with 5.5 inch screen, It has 3 GB RAM and comes with snapdragon processor. It has a nicely built back cover with great grip which makes it easy for you to hold the mobile.
I tried running multiple apps at a time to check the multi tasking feature, which seems to lag when running high end apps.
It comes with Full HD screen but lacks the quality which you will find in high priced mobiles.
The battery drains in about 6 hours if you play games or constantly use apps and about 10 hours for normal use.
At the end, I would say it is decent for the price range.
I will give it a Thumbs up.