I've tried them all, and theres none better (in my opinion) than my Jackson NexGen. I've had it since they first came out, and it has proven it's durability many times over - dropped from atleast 4 or 5 bridges, dropped from the roof of a 5 story building onto pavement, dropped atleast 50 times in the shop.
Oh yea, here's a good one, I used to build SS tanks - big ones! I was welding what is called half pipe onto the out side shell of a 40' tall 12' O.D. tank that was spinning on a positioner. Picture a 4" pipe cut in half (lengthwise), and wrapped continuously around the tank in a spiral from the top to the bottom, over a mile of weld on 1 tank! Anyways, I was apparently too close to the weld, probably half asleep, head started hanging lower, becouse I was laying on my stomach on top of a scaffold w/ my head, and arms hanging down. I ended up completly melting my helmet, and the black casing on the lense itself. Let it cool off - still works perfectly.
It was expensive when I got mine, but I hear they are way cheaper now, maybe $2-$250?
For the ultimate in summertime comfort, add on a Shadow air system. Expensive, but worth every penny if you do alot of welding.