To follow the presentation of the COMGROW T300 in the forum it is currently on sale at SOVOL.
I bought the T300! very nice mechanical performance all axles are mounted on linear rails.
the printing speed is fantastic little operating noise however you need a very stable desk on the floor.
Klipeer is native and the interface is feature-rich with very useful macros.
The print quality is remarkable the speed is its major asset; for example a print with a TLD3 6 hours with the T300 2h15!
you need to stick to the basic settings and increase the extrusion temperature by about 5° and increase the temperature of the BED between 60 and 64°.
Very satisfied with this printer I will invest in understanding the essence of KLIPPER especially the calibration of the extruder and other functions.
All this largely happens in the Printer configuration.cfg you have to refer to the KLIPPER online documentation which is a big help.
I use ORCA which is a very interesting interface and allows you to control the machine with the WEB page of Mainsail is very easy sitting in his chair without stress
The only disadvantage the filament spool plays the gig and generates vibrations in fast movements.
the very light mini test reel finished the race on the ground without shouting guard! 
So I made a new bracket mounted on bearings with two opposing cones.
A tapered screw locks the center hub of the reel (ends the noise and it is a safety of operation) so it does not move anymore….
Conclusion the T300 is a great machine and saves me time and the print quality is remarkable.
To say that KLIPPER is easy to install and set up I would say that it is another intellectual investment less plug and play than MARLIN. 
Here if you want I share with you my little knowledge but I learn slowly.
Well I am 75 years old and it awakens the intellectual potential of these little machines. Where progress no longer stops.