After reading a bit of the info about the horse hide, I also decided to try some.....and somehow completely overlooked this thread until tonight....which is kinda fortunate.
The piece I got WAS pretty stiff and was rolled into a flat rate box. A little time unfolded/unrolled and it straightened out.
The hide does take longer to case, and is VERY dense in comparison to cow hide of the same thickness. However....after a little experimentation and learning that it needs a little longer to case, I've found it to be quite suitable. The flesh side was almost as smooth as the grain side, and the cuts were so smooth that they needed very little in the way of 'finishing'. I evened them up, and skipped the slicker...moving straight to burnishing.
The results were quite a bit better than I was expecting. HH is already on the re-supply list, and provided I get some decent pieces, will be a regular item.
I also purchased some of the strips, and likewise, the flesh is almost as smooth as the grain. If I can get a longer butt, or more skinny customers, it will probably become the staple of my lightweight belts.
Here's the most completed rig made of HH. Everything except the thread, dye, and chicago screws is horse hide.