Just sharing my own experience for usage over a year long.
How bout a Roomba models I hope your never get unknown before.
For me Roomba is a best reliable robot vacuum in the world & LG Roboking the 2nd.
How to choose your right model or Roomba?
In malaysia usually won't be so large space of single or double storey house.
I would prefer you get model : Roomba 650 or 770 there both can cover up 1200-1400 sq ft. The only Roomba 770 come with more accessories in the original package.
If wanna choose for 780 I think not necessary at the end you still need to carry up for 2nd floor.
The value and best buy still in Roomba 650 durable and reliable.
How no prefer you get Roomba 780 or latest Roomba 880 there both only come with lighthouse for more larger space like condominium is a free space.
So we need to switch on lighthouse for zone to zone cleaning stage.
Every each zone with 1 lighthouse can be keep more detail to cleaning for 30mins in the zone only.
The extra accessories definitely is come with more.
Due to latest technology for Roomba 880 to be replacement by last week only.
The old stock of Roomba 780 will sell till stock last while.
For the latest price of Roomba 880 may higher, but still unknown yet.
In the US has announce the latest model of Roomba 870 but not so sure, seem like there has removed out lighthouse feature and sell for same price as Roomba 780 before
The overall here if you decide for Roomba 650 or 770 for normal home, if more large space can select on Roomba 780, 880 and LG Roboking in single charge able to cover up 3 hours job of 2000-2500 sq ft. That is the advance feature for Roboking also very damn quiet operates.
For the Scooba the only choice of 390 or 450 the latest model, so far still not getting in hand of personal review with the Roomba 880 too.
Hopefully we can imported more soon.
Thank you and have a nice day