I tried the Skeeby first in a 41, but I ended up sliding around too much and ended up with a size 40. It's hard to get a good fit as the ankle is so stretchy. You have to really tighten the laces so that the shoe doesn't move around even in the right size. I'd imagine the Keld and Tanga have similar problems. The shoe is very wide in the toe box and combined with how stretchy the material is, I image it would fit a high volume foot quite nicely.
The Skeeby has much less horizontal stability than the Vibe. The Vibe stays put really well with the padding over the rigid plastic in the heel and ankle area. The Skeeby doesn't have this same rigidity. I was sliding around when I brought the Skeeby to my dance class, where earlier that week I was dancing fine in the Vibe two sizes too big!
The toebox is even wider than the vibe (and way wider than the tundra)! Since the foot slides around so much, I have exclusively been wearing them with toe spacers.
It does seem breathable, I wore it once out in the winter cold going to the gym and my toes were instantly so cold and felt the wind.
I haven't yet tried to see the extra grip on wet surfaces with the UrbanGrip compared to the previous sole on the Vibe or Flex as I haven't been able to wear it outside in the winter. Not sure about the ground-feel either but it seems to be a little thicker. The sole seems to be less flexible than the Vibe.
I would recommend the Vibe for more stability! Or if you want stability with lots of grip on wet surfaces in exchange a little bit less sole flexibility and a little less ground-feel get the Vibe 2.