Hey AFM, well done you! The magnets addition for riding the board is an excellent upgrade but it posits some questions. I've picked up a bit of experience because many of my figures get photographed on a metal office shelving unit so they get foot magnets temporarily or permanently.
Neodymiums are amazing but I think I have a better buying tip than either Hobby Lobby or Amazon: Lee Valley. Not only cheaper and maybe stronger, but these have another characteristic that works great for our purposes. They have peel-and-stick adhesive on one side, and to quote the Lee Valley blurb, "The 1/4" diameter size uses a thin film adhesive that sticks best to smooth surfaces; the four larger sizes use a foam-backed adhesive that conforms well to slight surface irregularities." You can buy various sizes, but the best amazing deal is a set of 52 (various sizes) for $16.40 (US) https://www.leevalley.com/en-us/shop/hardware/rare-earth-magnets/magnets/disc/73479-adhesive-backed-rare-earth-magnets?item=99K3490 or $21.50 (Canada) https://www.leevalley.com/en-ca/shop/hardware/rare-earth-magnets/magnets/disc/73479-adhesive-backed-rare-earth-magnets?item=99K3490.
I am wondering when you made the sole incision, did you just insert the magnet loose, or were you able to glue it onto the figure's inner foot solid surface? Because, if it's only the resealed skin holding onto it, the risk is that it could strain and maybe rip the skin fairly quickly. I think that risk is also increased with that size of magnet, as it's actually stretching the skin. If I had to duplicate that task, with the benefit of seeing the AFM method, I would probably vary it by using the Lee Valley magnets that are already glue adhesive on the foot side; and I would probably slide a row of 2 or 3 of the smaller size into the foot rather than one larger one. Actually I keep buying sets of 52 and using up the larger sizes, so finding some legit use for the smaller ones would be a bonus.
Loving the AFM upgrade but still not sold on the underlying ADD figure. Even on the excellently lit and shot pictures by Diana (good job there) it falls unsurprisingly a bit short of the level of gleam/shine that the ADD promo pictures promised. Plus there's a lot of flocking that I can only assume ADD must have cynically photoshopped out of the promo pics. If the trade-off is between the ML Icons being shinier and stabler skin, but with the harshness of visible joints, probably I can live with that, especially as it was far cheaper and I have one already. It would be interesting actually if someone could make a version still jointed like the ML Icons but upgraded to actual full-on chrome, but maybe there's no retail market niche for that.