Just looked at the pic on warco. Are you comparing like with like re dro? Pic insert shows a 3 axis panel but specs state 2 axis.
Are you going to be milling with a lathe attachment? Def needs checking out, if you are!
£440 seems high for a 2 axis system similar to whatt they are fitting for £250.
What condition is your lathe – might be better than a new one in a few years time.
Only you know whether it is cost effective, but somehow I doubt it. Or it might appear cost effective, but would you be getting a sensible improvement – short term or long?
If you just want forum confirmation to justify a shiny new chistmas present, you'll not get it from me
!