OK Super,

Let me tell you about Robbie.

He is IRobot - now a few years old - but still the best thing since sliced bread - to say nothing of a pets best friend.

He is not too noisy - goes under couches & beds - some don't they detect a valance or whatever & don't go there.

He has stairs to cope with - has never fallen yet - he detects a stair and turns.

I have carpet upstairs - wooden floors  with carpets/rugs - downstairs - he conquers the lot.

I purchased extra  'virtual walls' - these are thingys that keep him in one area - without those he will just roam.

Any questions - he will be happy to answer.

PS the dog thinks Robbie is her bestie - she is fascinated by him.