Andoman,
Let me introduce myself, I am David Ando(some coincidence eh?).
Anyway I am president of Turtle Southeast and grew up running mills since I was in H.S. Currently we have a Roadtec RX-400 in our fleet. We traded it in for a Wirtgen W1200FT. We were having a ton of electrical issues with the 1200 which is why we decided to get rid of it. The 400 has superior hp and a bigger conveyor than the 1200 whcih allows us to mill deeper and maintain production. The configuration is the same as the 1200 with the drum to the rear of the mill which allows you to back into corners that can't be accesed with a standard mill. The draw back with this configuration is that there is no visibility on the left side of the mill, this limits the funcionality of the mill when steering from the left side would be necessary. It is kind of a trade off. Since we use this mill only in specialty applications it works for us.
If you ever have any troubles just call Nashville( Writgen America) and ask for Erwin, he is a trouble shootn god. Can always get parts over night from them. Just my 2 cents.
Never seen a Roadtec like that. Bet there aren't many atall.
You thinking about buying it?