My pitchers love them also. The only other ball I would buy for my pitchers would be the Worth Dream Seam. I've found that the Dudley's with the leather cover seem to last longer for hitting though. I'll buy a new dozen each year to let my pitchers warm up with at tournaments and every couple of tournaments rotate new ones in. The old ones or slightly used ones get rotated into the hitting bucket and replace the ones that are older. Those get relegated to our indoor facility for tee work and fielding drills.
The only thing that my DD likes to throw is the Dream Seam. I don't see a huge difference between them and the Thunder Heat, but in her hand apparently there is a huge difference.