I did try the cold heat. Don't buy it. The tip broke in a very short time. It's extremely hard to use. You need to create an electric path between the two parts of the tip for it to heat and it's very hard to do. It does not heat a large area. It gets cold too fast.
Don't even think about unsoldering with this.
I use a radioshack 15-Watt Soldering Iron with Grounded Tip (64-2051). It's half the price of the cold heat and it's much better. But you also need to buy a stand with a sponge. It's very good for the price except when you need to solder stuff that takes more heat like connectors and big fat ground wires or when doing desoldering. I use a more powerful soldering iron for those tasks.
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