Roborock S55 vs roborock S50 2nd-gen, Save $90 Now!

Today's Best Choices:
2018 Newest Mini PC & TV Box,
Best Vacuum Cleaner in Clearance,

roborock S50 Smart Robot Vacuum Cleaner – WHITE ROBOROCK S50 SECOND-GENERATION. It has 3830 Customer Reviews, which means roborock S50 is worth buying? Maybe! But $499!
2-in-1 Sweep Mop LDS Bumper SLAM 2000Pa Suction 5200mAh Capacity

However, Roborock S55 is $90 cheaper than roborock S50 2nd-gen, but few people buy, why?
Roborock S55 Intelligent Household Smart Robotic Vacuum Cleaner

It is interesting that these two models have similar parameters:

Main Features:
2 in 1 Sweep and Mop
– Double cleaning: sweep first and then mop the floor
– The filter is root-inspired when the mopping pad is served as leaves to control water flow like a living organism. It can mop the floor constantly for 45 – 60 minutes
Intelligent Route Planning
Laser Distance Sensor ( LDS ) allows the robot to scan its surroundings at 360 degrees, 1800 times per second, with the Simultaneous Localization and Mapping algorithm to map out the interiors of your home and then provides real-time planning routes, edge cleaning followed by Z-shaped cleaning according to the surroundings
5200mAh Large Capacity Battery
The robot carries 5200mAh Li-ion battery which ensures 2.5 hours cleaning for a house of 250sq.m in full charge
2000Pa Super Suction
With a strong power, the robot absorbs all the debris, steel beads, soybeans, dust, millet or any other wastes all in a sudden

Check full details here.