I have both the S6 MaxV and the 1C. Bought days apart around the 27th of August 2020.

The S6 MaxV with LIDAR is much superior (of course costs a lot more as well) and maps out the rooms much faster. The laser maps out the room without needing to travel all the way to the end to find the wall.
The vacuuming and mopping are good and consistent and the obstacle avoidance is better and water tank is bigger. Can do 2 or 3 rounds before I need to fill up water.
For bigger houses, would recommend this. I do not have carpets so cannot comment on this part. Also a lot of intelligent features that youtube reviews cover, so will not go into that.
Also support for multiple floor maps, so that saves time as the unit recognizes floors already mapped and does not need to do the mapping everytime.

Experience with 1C, much cheaper and bought it for my hard flooring to try out since much cheaper. Much slower to map as needs to traverse to the end of the wall to sense it.
Water tank much smaller but enough to mop a few rooms with the lowest or medium setting. However, after 4 weeks, I noticed that the water does not come out well and mopping is not effective.
However, after 4 weeks, I noticed that the water doe not come out well and mopping is not effective.
Probably the water pump is not working or air inlet is blocked somehow. Need to get it looked at but haven't had the time.
Vacuuming is still decent and picks up a lot of dust and debris. However, I find it is susceptible to have hair entangled in the side brush and rollers. Something that has not happened with the S6 MaxV.

[Updated] The issue with water not coming out is that the air inlet valve is blocked somehow. Not sure how that can happen. Need to open the water tank inlet to let release the trapped air pressure.

My experience with both is that it is worth spend the difference, if you can afford it, to get the features and reliability.
The S6 MaxV has been vacuuming and mopping every night without fail since I purchased and does a real good job on the hard marble floor.
The 1C mopping feature failed after just 4 weeks, albeit temporarily until I figured out the problem, and this also I did not schedule mopping every day and without obstacle avoidance have to make sure the floors are clear.
For the price, I think it does a decent job.

I would think the S5 Max would perform similarly to the S6 MaxV except without the cameras for the AI based object recognition.
Hope that helps.

This post has been edited by aloy237: Nov 10 2020, 09:09 PM

Figured out that it is the air inlet valve being blocked somehow. It is on the inside of the water inlet cover.
So have to open the inlet cover to release the trapped pressure. Just found that out when trying to figure out the fault.
Yes for just vacuuming and for being able to recharge itself and continue, it is worth it for the price.