there is a "new" version of the firmware for the Folgertech Prusa i3 out that is much less buggy than the original version, and there is an updated build guide to go with it (especially in regards to endstop placement & wiring - you want the one labeled "Beta")
There is nothing wrong with the Folgertech 2020 Prusa i3 kit. with the updated firmware and assembly instructions you should have no problem building it and running it.
The frame is quite solid and the extruder/hotend assembly is fine. Mine still has the stock hotend on it, altho I did "upgrade" the extruder assembly slightly by printing & installing a spring loaded tensioner - something that the current kit should now have (it did not when i bought mine about a year ago)
The only thing they have not implemented to date is proper belt tensioning, which is a fairly easy thing to take care of once you have it up and running.
During the build process, you will need to make sure you get the belts as snug as you can so they don't skip - use the springs if needed to provide extra tension, then, once you have it running, print out a few extra pieces to properly tension the belts. (files are available for free on thingiverse)
For the price of this printer, it really is hard to beat.
again, I would suggest going with the 2020 version, NOT the acrylic... the 2020 is more stable, stronger and $10 cheaper...
SD4 #1 & #2 - Lawsy carriages, E3D v6, Rumba controller board, mirror bed plate, X motor fan, upgraded PSU & Mica bed heater
SD4 #3 - in the works ~ Folgertech FT-5, rev 1
Printit Industries Beta Tester - Horizon H1