Well, I am using their Zens wireless charger as linked below.
This Wireless Charger has an ultra-thin design and is designed to (fast-)charge two devices and an Apple Watch simultaneously.
www.makezens.com
Maybe it's just me, but there have been times when I place my phone on the wireless charger (and it starts charging), then wake up the next morning to find my phone not charged at all. As I don't use a case on my 8+, it is possible that the phone may have slipped off the sweet spot to enable wireless charging.
The funny thing is that I don't recall ever having experienced this on my previous Anker wireless charger before.
I know - people will just say - just use wires and you won't have this problem either, though that's not really the point here. Wireless charging as a basic technology is fairly inexpensive. It's the incremental improvements that cost a lot more, because of the sheer amount of engineering that goes into solving what seems to be a fairly minor issue for most people.
At the end of the day, I see the price of the Liberty wireless charger as a fair indicator of the amount of effort that was put into making such a concept possible, even if the benefit itself seems fairly innocuous.