Sorry for the late reply, had some ISP issues.
Yes the PEX400 is a random orbit sander, I have not tried to change backing plates but would assume this would not be possible ast the factory backing plate has lugs that locate it to the body. It has 400 watts and I have found it to be powerful enough. The shape of the tool is its biggest issue it is very tall, which can make it awkward to get into tight spots. The second handle on the Bosch is on the front of the unit not on the side like the porter cable.
The Bosche PAX400AE

Results on my wifes car
