I bought this tool a few weeks ago and have found it to be very nice to use. It covers significantly more real estate than the 150 ROSs and can get into corners at least as well as the smaller, more aggressive rectangular sander(RS400). The orbit is 2.5mm, making it possible to achieve very fine finishes, yet it is pretty aggressive with 50 or 80 grit paper. I would guess that it does not get a lot of attention because the RS400 sander is less expensive but I really see a lot of potential for this machine. The extra length should really help on panel doors where the panel is flush to the frame, making it easier to bridge the gap and keep the sander under control. It is very smooth and easy on the hands as well.
Greg
Greg