I have had these for about 6 months now. All I can say is "where have you been all my life!"
These are great!

I use them all the time. They not only keep my fingers from freezing up on cold days (been down to the teens), they act like a massager on long rides.
I'm not going to say that my summer gloves and these keep my hands warm in the 20/30's, but they do keep them warm enough that they don't get stiff and they certainly don't hurt. I hate heavy gloves and this is just what I was looking for.

At $99 and a 45minute install, they can't be beat. Install was really easy and the instructions were perfect.

They have done well so far in the rain.

They do draw quite a bit of power and if I use them in stop and go traffic with my gps and my passing lamps on I can see my headlight dimming some. Regular riding and all is good.

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So now I have both.  Heat Demons on the softail and HD heated on the ultra (heat demons don't work with TBW)

They work about the same.  I like the button better than the stiff dial on the grip end.   HD has 6 settings, Heat Demons have 4.  I use 2... Super Hot or a little warm

I like being able to have the grips of my choice as well. 

So... I still rate them very highly. 

Do note that I've had 0 issues with either and they both put out about the same amount of heat.

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I got the heated ironsides ones.

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Lookin at a set on ebay right now.

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05 Road Ultra