Just finished uncapping my medium frames of honey by using both an electric uncapping knife (fixed temp) and a 9 inch Cutco Serrated Bread Knife to study which tool worked better for me. Last year I bought the electric knife ( $85.) to uncap my 2nd year honey crop. There were things about it that I did not like, such as the weight of the knife, the handle was not comfortable in my hand as it was quite painful ( 20 years of whitewater kayaking did not help the joints either ) and the way it melted the comb ( yes it's suppose to do that) but it just created a bigger mess and just took too long to cut through a frame of honey. Even though it was my first honey crop and a happy experience, my hands and wrists were not.
So this year, another Beek from my Bee Club heard my complaints about uncapping knives, the awkwardness of them, the price, etc. He went on to tell me that he went through the same experience until another Beek told him about using a " Serrated Bread Knife ". how much better it worked for him and that it will be the same for me. A few weeks later, I found a used Cutco knife for $40. and guess what folks, he was RIGHT, what a difference it was. And BTW, I've learned that Cutco will sharpen your knife for free for as long as you or anyone else owns the knife ( you pay for shipping) Bye-Bye Electric knife :-D
Please do yourself a favor, before you go buy that expensive equipment, try a very good quality bread knife that is serrated and please be careful. You may change your mind too. The Bread Knife won hands down and my hands and wrists were pain free. :-D