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Finally, I bought this one because it comes with car kit, a air driven brush which I think it can intake more dust proactively. This unit is quite noisy as many forum mentioned. Also, the exhausted air direction may be in my cleaning side and blow my "target" away. Also the unit is quite hot, I am not sure if this is normal.
I looks the same as OSIM.... which one is the OEM? I heard a lot comment that the OSIM filter needs to be change so I give up

After several weeks of struggling, a pair of small robot hands is built though it is not nicely presented. Spending time in building palm and finger is not a big deal. Finding the right servo is really a painful job, and there is no off-the-shelf solution. It comes up with a lot of modification with extra effort and money spend in return. I can now move one step further to connect the hand to the arm. This will add 4 more DOF to the robot. exciting!!!