Zero return problem....not really a problem just an inconvenience; with the original turret I could turn the power on, hit Reset and then Auto Restart and it would home the X and Z and the toolchanger to position 1. Now I have to stand there and do all three individually using Zero Return and Single Axis.
I think you will find it is not as easy to disconnect and take off as the original version; many more connections to undo.
Cannot say anything about the tailstock, I only use it once every blue moon.
An open mind is a virtue...so long as all the common sense has not leaked out.