I have the Ultimate not the Deluxe so YMMV. The sheet is fine/ decent. No tears or holes but it’s only been one season (now going on 2). It does fit tight in the chest as noted above and my TB is not super wide upfront. I’d pass or size up AND buy a chest extender if you have a stock type or wide chested WB.
I bought the SP sheet on sale and bought a Schneider’s sheet for my other horse (both sheets were each respective company’s most warrantied/ strongest sheet). The Schneider’s is undeniably higher quality. It breathes better, the lining is so soft and nice, and the hardware is all hefty and solid when compared to the SP. So. The SP is fine. But I wouldn’t buy it again unless it was on super sale.