Are you referring to the heated electric un cappings knives?
If so, I recommend you try one before you buy one. If you are not using it continuously, they tend to over heat and then they burn the honey and change the flavor. I have one but I do not use it.
We mostly use a serrated decapping knife. It works real well.
I did recently buy, at a yard sale for a couple of bucks, an electric carving knife. The next time we pull honey we will try it. I?m told they work real well.
Jim