Hi, I have the 2500 model. It's great for drywall, especially into timber studs with coarse thread screws. It's a bit more of an all-rounder when it comes to using it with different materials like plywood, OSB, cement based boards, etc.
The 4500 will probably perform better using fine thread screws into metal studs.
Great machine and stands up to the rigours of site work without any problems.
Oliver, good point about the PDC/DRC. I have the PDC as well.
It's a tough, capable machine. It is well suited to decking and framing work, and a lot less noisy than an impact driver. It's my go to driver for all my work, and the 5.2A batteries last for ages.
BTW, there are also PZ2 bits available for the magazine.
Regards, Alan