I'd guess pro bats are about whatever the pro prefers, level dependent of course.
Whether its grains, performance, handle shape, low density, if you're a huge name you'll get what you ask for.
Further down the food chain you go the less power they have and the more likely it is that they have to be happy with whatever the company decides to offer them.
Like most on here I've had a few pro bats through my hands that I believe were actually owned and used by the pro, not just made for. some of them have been huge, some of them have performed really well, some both, but ultimately with the willow and makers we have access to on here they're no different to what you could get by going direct.
However if using a bat made for Root gives you the confidence to score a few more runs then who cares, maybe it's worth a few extra quid