To be honest and I have done a few Warco versions of the same mill that sounds very cheap.
I could not do one for that price but having said that I refuse to cut corners.

If it's the mechanical kit at £500 plus the E2 kit at £150 it still needs all the machining doing so there isn't a lot left.
that E2 kit isn't top class.
For a start it's not got a proper breakout board to protect the computer and with no 5v supply it may not work with a lot of 3.3v parallel port computers.
The drives in this kit, - well I'd sooner say no more, I'll leave that to Jazz