What I do like:
The display. I was surprised to see that this charger has really become my go to for testing electronic devices. Yes, due to the heavy duty nature of it, it does get used for charging devices all over our home. But what I like about it is the display that will tell you what's happening with the charge that most devices simply don't address. This has become incredibly handy for testing. For example, my daughters tablet just stopped charging one day. I tried numerous dongles and cables and nothing. Thanks to this I was able to plug it in and see what was going on. Similar situation with a set of earbuds that I have.
Charges pretty much anything and will charge a lot before needing to be recharged itself. I think the advertised recharge time is also pretty correct. I would put it at about approximately 2-3 hours.
Build quality, seriously feels like a brick.

What I dont like:
My complaints are really a bit minor but one couldve been an issue. As this was nearing a recharge I figured Id plug it in and get it filled up. Sadly, I lost the manual and instead looked at the product page. Which shows C1 as being the in/out. This is incorrect. C2 is the in/out. C1 is for charging only. I had this plugged into an outlet for 30+ minutes and noticed that the battery level was going down... I switched ports and the display screen changed to a charging screen and off it went. I guess I was charging my house for a bit??? My other complaint again has to do with the product images which shows the port cover as being something that flips up. It does not. The charge cover is a rubber cap that doesnt attach to the device unless you're not using it. Its either on, or its off.