Had a demo recently and this is the conclusion.
The demo is aimed to confuse you about your home air quality.
1. They ON the vacuum and allow the water to mix with air, next they shine the light into the water and claim that air is dirty.

It is air bubbles in the water caused by machine using water filter.

Objective is to scar you into thinking your home air needs to be cleaned due to bad air.  That is pure rubbish, since if your air was bad, you need check your lungs first, you must be terminally ill due to bad air.

2. They pour some aroma therapy into the system and let the water vapor come out, claiming that it will improve your health.

Get a humidifier for RM200, same job done.

3. They take it up to bedroom to show it can clean your bed. Claim is bed bugs can be trapped and sucked out.

If you had bed bugs, you will know about it since you will have bites. Scare tactic to make you think you need it.

4. The price is RM11,850 is a way to expensive for a vacuum given that top ten vacuum, it is not within top 3 in the US itself. 

5. Size of the vacuum is too large, given the current day and age, simple sucker with a portable battery is the best, not a bulky beast, as indicated by others that have bought it and gave it away.

6. The claim it is used by hotels and hospitals is bull, since none would spend so much for a sucker.

7. Most of the people who claim it is worthwhile are those that are the agents of the machine, trying to defend their product, so as to give some authentic view

8. Final conclusion - over priced product that does not have the status and symbol of a ferrari or rolex - those are show off items.

9. Seriously, this is not a status symbol, it is a cleaning utility and one that cannot justify the $$$ invested

10. Video of rainbow vs dyson experiments in youtube indicates that both are similar cleaning power, so buy a dyson.

End of my opinion on the demo itself

Yeah.
Some more Dyson V10 is not so expensive. It is a good buy.

RM 2,699 for Fluffy version with soft roller head, only if your house only got hard floor.

or RM 2,999 comes with additional torque driven hard brush roller, much more versatile for any type of floor.

For those interested...

Why buy Dyson rather than other budget cordless vacuums? Watch this...

Im looking for a vacuum that can suck out dust mites and dusts as i have allergy to dust mites..

Seems like everyone recommending Dyson here, isit really worth it? I check the pricing is like one office laptop price.

Hmm.. cuz my house is small also, if i use these two things seperately. It will be "bulky" to my storage haha, i preferred something portable but packs a punch. So far i found Dyson's one is pretty suit my needs.

Yes boss haha