I haven't been in heavy rain with either. Oct. 2008, I was in Yosemite, first evening out, it rained moderately, I was getting spritzed there in my BD Hilight while it rained. 2007, same time of year in Yosemite, third night out at Sunrise Lakes, using my TT Squall, had snow pellets in the afternoon late, turned the ground white, heavy condensation overnight, before dawn it snowed again knocking the condensation onto my spread out clothes. That's why I went with the Hilight, hoping it would be better. It gives me more shoulder/head room in Fall and Winter conditions. I don't like the Hilight, takes a long time to set up and is a pain to insert the poles from the inside. If I had weighted it befored I seam sealed it, I would have returned it to REI. It weights 3.5 lbs. Maybe a Moment down the road.