It’s big, it’s heavy, it’s sturdy and it has a lot of high-tech features that a modern charger should have.
Build-quality:
It seems very durable and there is nothing in the design I’d suggest to improve. Some say the batteries go in upside down compared to what they are used to but that’s not an issue for me at all. It’s larger than most which allows plenty of space between batteries to prevent overheating.
Display:
Very nice looking, blue readout with a ton of battery and charging metrics. The most important metric for the battery strength is mAh. Anything over 2000 for AAs is fantastic and under 1000 may need  replacement. I run test [normal] and let the charger discharge, then fully charge the battery. Upon completion it gives you the mAh rating. It’s that easy!
Charging:
You have 4 options of current to recharge with: 300mA, 500mA, 700mA, and 1000mA. I’ll use 300mA for AAA batteries and 300mA or 500mA for AA’s. The higher charges will charge batteries faster (which generates more heat) but you get less cycles from your batteries. If you don’t care about all the bells and whistles of the charger you can simply put in batteries and it will stop when they’re charged. Just remove them within a few hours of completion.