I used my Roomba first followed by Scooba. My power LED is still green even after 2 COMPLETE cycles, which is enough to cover 3 bedrooms and 1 living room. Dirty water drained out is slight greyish in colour. As my place is cleaned daily, when i clean Scooba after the 2 runs, all its components are pretty clean. Nothing dirty in the filter and the brush did not appear to have hair/debris twined. One thing I noticed while Scooba was cleaning, it does occasionally make some squeaking noise. Also, if u stopped Scooba halfway in the clean cycle (say to move it to another room) and pick it up, there's a small puddle of water left on the floor. If u activate the dry cycle before picking up, its ok. I hate it when u pick it up and it drips a little while u carry it about. Do u guys face this problem? As for the noise level, seems pretty quiet to me. If i were to compare, it seems a little quieter than my Red
If i need to cover all rooms + kitchen + rear yard all in a day, i think i need at least 3 clean cycles which will take 150 mins!

For those with no patience, perhaps 2 units of 350 will be ideal for a typical sized apartment (if u need to clean the whole house in 1 go). One more thing, u cant beat the Scooba in terms of cleanliness... its even cleaner than manual mopping!
btw how's yr 350? the battery lasting for 2 full tanks?
my mum wants to get 350 also in future.