I'm also using the Rainbow Vacuum Cleaner. Agree that its heavy.
Noise level I find still bearable. Cleanliness really superb! My aunt and mum use for 10 yrs and its still workin.
I use to work in OSIM b4, so technically I'm abit familiar in this part. Water is good, as it traps all the dust into the water. Bags are not gd, bcoz after you suck in, when you wanna throw, its all over the place again.
And you know the conventional vacuum cleaner right? The back expels some heat and that is where some dust and carbon are being release into the air again thus it does not really clean your air properly.
For Rainbow wise, I use it to clean my mattresses and sofa like once a month. Those dirty particles you see in the water are actually our dry skin flakes, dust mites and dust particles as well. I dun think I will invest in another machine again as this one is really value for money. $3k use for more than 10 yrs leh! So its like $300 a year! I think its really worth it. Further more, the cleaning part is really good. I like the fact that it can clean my mattress and sofa and my kids pillow, soft toys, I'm happy enough.
Aurora, but be careful when you use the iEcologi bcoz it tends to get very hot when you on it for too long thus the motor is not able to restrain long usage. And if you hear that the motor gets louder means the power will cut off soon to prevent the machine from overheating. However, for the cleaning part, I would say its really a good machine. Bcoz b4 I left OSIM at that time, I borrowed the machine from my DEMO team and use it at my home as I just had my place renovated. It really cleans very well!
My 2 cents worth!