I think cloth mouse pads can wash with water no problem. I even washed my Qck+ with water, hand shampoo and brushed it with toothbrush (LOL). I used hand shampoo because its mild.

And I heard that cloth mouse pads cannot touch soft drinks, especially mountain dew.

BTW can anyone give some opinion on the SS Sensei? I plan to upgrade my logitech mx518 to it. Currently using Qck+.

After some google search seems like many people state that Sensei has some positive acceleration when using with cloth pads.
Does that affect much on gaming?
Results from my googling I found out people says that good players prefer mouse with no accel. But then, the Steelseries sponsored players are using Sensei with Qck series pad.

Sensei have changeable lights, LCD on below for changing profiles on the fly, metal-like surface.

Both using the same sensor (correct me if wrong), same shape.

Sensei Raw has more choice like Glossy, Rubberized, Tyloo, Frost Blue.

IMO its worth the price. I get my Sensei on 12 May so I am still a new user of Sensei. So far no problem since it is new.

If you visits to cybercafes or uses different computer frequently, its change profile on-the-fly feature can help you. You can preset the profiles and then change it on-the-fly without need of driver on the computer after you saved your profile on the mouse.
Sensitivity, 3 of the lights, those exact- technologies are saved on each profile.
I didn't visit cybercafes or uses different computers but I share my computer with my brother, I use a slower CPI than him and of course different colour settings on the mouse. So changing profiles was useful for me.

Other than that, the 3 customizable lights

I swapped to Sensei after 3 and a half years of Logitech MX518 servicing me.
Both mouse was quite good for me. At first I was not used to its shape, after some time I slowly get used to the shape of Sensei and I was able to perform better with the Sensei.

Mine was the same as well. Right click was harder to click than left click.

I am having the normal version of Sensei.

I think its not a defect unit of Sensei because it seems that the hardness of left click and right click were purposely tuned like that.

It was comfortable for me anyway

So I will live with it

Yes me

Cloth mouse pad like QCK are safe to wash with water.

I just throw my Qck+ into water.

Then let it dry.

First time I wash I can see the water is in brownish colour.

Well, my Qck's top layer is still intact after wash.

I do use some hand shampoo to wash it, but I think the cloth pad should avoid from strong chemicals.

After few years of use my Qck's top layer does not peel off, so I think it is a quite durable cloth pad

My Razer Goliathus also peeled off at the side, but it doesn't become worse after I wash it.

Not sure what causes that

I have a little bit white stains on my mouse pad, before wash and after wash. But at least the dusts were washed

Maybe.

Anything happened after you washed your mouse pad? Like the top layer peeled off or what

You can set the desired CPI to both LED profile. So the LED will indicate you which CPI you are currently using.

I am having the normal Sensei. The scroll wheel was silent.

Of course go for mechanical