Hasbro Transformers RPMs - Optimus Prime, Bumblebee, Megatron, Ratchet, Robo Riders Sideswipe

I take a look at an older Transformers toyline where Hasbro produced their own diecast vehicles of Optimus Prime, Bumblebee, Megatron, Ratchet and Robo Riders Sideswipe. Later they were made from plastic completely. Looking back, they should have partnered with Hot Wheels, Tomica or a similar brand to make higher quality fun vehicles.