I have only done 1 batch (an amber ale) with this MLT, and my experience was similar to what Kahuna describes. I also use a SS braid, and I pre-heated the cooler prior to mashing. I think pre-heating is key in this large cooler.
I heated my strike water to 12 degrees higher than my goal mash temp, and actually had to leave the lid open for a few minutes after striking because my temp was 2 degrees too high! After I hit the desired temp, I closed the lid, wrapped it in a blanket, and lost only 2 degrees during the 60-minute mash.
I batch-sparge, and had no problems with a stuck sparge. I did have to tilt the cooler a little at the end to get some of the wort out. I miscalculated a little, and was about a quart shy of my goal volume, which I will take into account for next time.
Overall, this was my most positive experience with AG brewing to date. Pre-heat your cooler people!!
Now if I could just started kegging! :rockin: