Finally got to try out the cooler!
Brewed a couple batches in the past few days and everything went very smoothly.
This thing is a real pain to heat up on brew day, so I've leared to prep my brew water the night before, boil it all (for me about 7.5 gallons) and pour it in the cooler to heat over night. Worked perfectly.
On both 5 gallon brews I mashed with around 3.5 or 4 gallons of water and lost about 2 degrees over the span of an hour.
My efficiency averaged about 70% on the first brew and 73% on the second.
For my maiden voyage, I'm very pleased