CL600 Whats the score with these

[Zippyworld]

I am considering changing out of my 98 Jag XJR and I am more than interested in the CL600.

My budget is circa £6k so I will be looking at W215, possibly an early one, can anyone tell me was there a facelift and interior update on this model that featured the slightly bigger COMAND unit, etc; ?

Is there a buyers guide that anyone can point me in the direction of please ?

What do I need to be aware of when buying ?

Thanks