As much as I love both breeds (and own a full Shire), I personally, wouldn't take that cross, neither breed is really adding anything different to the cross. Both are large, heavy, high stepping horses. Neither is particularly quick or agile, neither is much built for jumping. I'd take either breed crossed with a Thoroughbred or Arabian in a heart-beat if the horse had quality, but the two together is going to be a large, heavy horse, losing the benefits of a "warmblood." I've seen this cross multiple times, and it always baffles me why people do it.