Ordered, received, and assembled a TronXY X5S. The printer comes as a kit, is quite cheap (got mine for $310 delivered), offers a largish ~300mm^3 build volume, and uses the CoreXY layout.
The kit as received has … issues. Knew this before ordering, as had checked before for what other folk had said online. This is my second printer. You would not(!) want this as a first printer. Bought this as an exercise.
Overall, this kit feels like some smart kid built a printer as a high school science project, and then someone decided to ship the same as a kit. Lots that is not well thought through … which is fine for a kid’s first project. 
First major issue spotted during assembly was the heated bed. The artwork suggests this is one of the http://reprap.org public designs. It is not. There are two different URLs printed, and both are bogus. Which is unfortunate, as if the maker had put this in front of the community, they might have got needed feedback.
The heated bed is a bit dangerous. The copper bus bars are too close to the edges, and much too close to the drilled mounting holes. The bed springs will eventually scrape through the thin insulating layer, and make electrical contact to the frame. This is not good.
Used a bit cut from a business card (heavy paper) as a temporary fix.
The thermistor is directly against the heating element. This is always going to read higher than the actual temperature of the print surface. Especially as the actual print surface is a ~2mm plastic(!) sheet. As plastic is a thermal insulator, likely more heat will escape through the bottom, than will in fact heat the bed.
Also this is a large print bed, made of quite thin material … and sags in the middle (and likely more when heated).
Have a sheet of cork to insulate the bottom. Need to find some appropriate-sized aluminum extrusion to brace the underside.
