Even though the rupees has an extensive throw compared to the flex, after my own use and multiple reviews I came to the conclusion that the rupees is underpowered. The 500watt motor should have been upgraded to what the flex has (900watt). The rupees does tend to bog down when moderate pressure is applied. Yes it sustains more than a PC but then again you are paying alot more as well. The Flex with the 900watt motor and forced induction just doesn't stop.
Yes the rupees will get your work done faster because the throw is bigger by 13mm and therefore covers more area in the same time but if its a simple wax job only. When it comes down to correction ability the flex wins hands down becuase of its enormous power !!
Hope this helps.