No, I got a new one...that phase change stuff was just barely adequate for 30min or so.
After 30min it was still cool, but not cold, and past that it started acting like a jacket.
It was better than nothing, but definitely not the best.
This new jacket is like pouring ice cold water down your back, I don't even break a sweat in 110F weather.
It's a 4.4qt backpack with what amounts to a camelback that you fill with as much ice as possible, then top off with water.
There's a battery pack to circulate the water back and forth through small tubes woven into the vest, and another small tube that you can use for drinking.
An on/off switch on the shoulder strap lets you turn it off for a little while if the cooling is too intense or you're trying to conserve your ice.
I also have a 9qt cooler system for when I'm flying the agcat, so I can switch between them with quick connects.
Picked up some pants made the same way, haven't tried them yet, but I would expect they'd allow twice the cooling to occur, while consuming twice the ice per hour.