I have the L7 installed and wish I knew about the Aqua Cube before. The digital temp control is great on the Aqua. The Eco you have to mess with temp control all the time and waste water getting it right.
I have had issues with the L7 working properly at 6000ft or so on the last trip we went on. As soon as we came back down in elevation it worked great but I am up high a lot. Customer support stated it's rated up to 7000 or so but not the case on the last trip.
I'll have a full trip report on the Aqua in three weeks when we get back. Two people in the group will be using them for the first time.