Hi,
I currently run a Hans Panel and have done so for a few years now. Can't fault them to be honest but being objective I've only ever grown under Hans or Sunshine so I've little comparison with other systems.
All I can say is that on my last run (micro grow, scrog, organic live soil water only set up) I pulled out 96g of one DP Blueberry under a single 80W panel that I bought 3 years ago so I'm happy with them. This is fairly consistent with all my auto grows to date, certainly over 1g per W every time and I'm by no means an expert....every day's a school day!!
I've just picked up another 65W unit to run with my current grow, my box has passive intakes and these panels run on average 3-4 degrees warmer that the outside temps, very manageable.
Hope this helps.
Trimix