I smoke a lot of coins - Dunhill DNR is one of my absolute favourites, switched in with Peter Stokkebye LBF, which is an excellent, stupidly cheap alternative. The LBF is not as tasty, IMHO, but still really enjoyable. I haven't tried the Newminster Slices, but I think they're very similar to the LBF.
Essentially a flake, coins can be folded/rolled/Z-folded (my preferred method)and stuffed. They can be rubbed out, but one difference to regular flakes is that they can also be unwound so that you have a loose skein to pack. In reality, you'll find that some of the discs will get rough and fall apart at the edges - especially if you buy bulk and they've just been lobbed in the bag to ship - so you'll have some long loose bits anyway, but the difficulties I find with the unrolling method are:
1. It can be messy;
2. The tobacco packs loose and can burn hot and fast;
3. Some coins, like the LBF and Newminster Slices, have the bullseye of dark tobacco in the centre. Cavendish for DNR, Kentucky for Newminster. Either you have to unpick this as well, or place it somewhere in/under/on top of/next to the loose tobacco. This, in turn, dictates when you get the taste of that centre leaf and how it mixes with the rest of the blend.
I prefer to try to keep the coin as the blender intended, hence the Z-fold which holds the bullseye in place. However, I know there are some who unravel the tobacco and position the core, others unravel/rub the coin and break the bullseye up through the loose tobacco, while yet more pop out the dark discs and keep them to smoke separately! The choice is yours...
One big benefit of coins, to my mind, is that they're generally clean and easy to use if not unravelled. You can also work them to the size of the bowl by folding/rolling two or more together for a thicker wad and/or stack the wads one atop another for height.
I hope this helps. The only thing I know is that I go through coins too quickly! Enjoy!
Andy