What are your opinions, yay or nay? Do they have any adverse affect on knives?

I don't like them simply because I don't think it's a good idea to have deliberately magnetised kitchen knives.
I automatically touch up a knife with the steel before using it. If the blade was magnetised particles of metal could cling to it and be transferred to the food.
My very simple wooden rack on the wall by the working surface is all that's needed. The strips of wood, about the thickness of a school ruler, cost a few pence many years ago and the rack has worked perfectly from day one.

Good call, also it just looks naff, even with steak knives. A good old wooden knife block is better.
For my part, as there is always steam going on in my kitchen I noticed years ago that the steam was helping dust and suchlike to collect on the blades. I got tired very quickly of having to clean the blades before every use. Now that I have fantastic Japanese steel Knives I reckon that the steam would help the blades to discolour quickly as well.
I haven't detected any probs with my magnetic knife holder. Also, when i steel a knife, I wipe it off before using it, if I remember to do so.
(Have you ever considered what the radiation from your computer screen is doing to your brain?)
I haven't detected any probs with my magnetic knife holder. Also, when i steel a knife, I wipe it off before using it, if I remember to do so.
(Have you ever considered what the radiation from your computer screen is doing to your brain?)

I haven't detected any probs with my magnetic knife holder. Also, when i steel a knife, I wipe it off before using it, if I remember to do so.
(Have you ever considered what the radiation from your computer screen is doing to your brain?)
No.

I haven't detected any probs with my magnetic knife holder. Also, when i steel a knife, I wipe it off before using it, if I remember to do so.
(Have you ever considered what the radiation from your computer screen is doing to your brain?)
Yes.

I like them: they keep the knives away from each other. Tho' I accept that the wooden block does the same job and has more aesthetic appeal. Still, I prefer the magnetic rack for its 'immediacy'
(Probably why all my clothes are on open racks and not in wardrobes. I asked a friend what she thought of my 'open' clothes system. She said it reminded her of an Oxfam shop).