I have a PC ROS and 2 quarter-sheet sanders. I find the ROS is faster given the same grit of paper. If this one dies, I'll buy another immediately. However, I still use my 1/4 sheet sanders a lot. I find they don't fight me as much when I'm trying to sand the edge of a board, and they get into corners better. All 1/4 sheet sanders are not created equal. My PC 330 Speedbloc is truly a pleasure to use. It has much less vibration and leaves a better finish than either of the other two. And it's faster than my Makita quarter sheet. I'd recommend it to anyone who is having discomfort using something else.
“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain