I’ve used a Tom-Tom PND with Live Traffic for 6 years but 95% of the time I don’t have it navigating anywhere but keep an eye on the home screen just to see where all the traffic jams around me are and glad to see that my KIA uses Tom-Tom LT too so continue to use the in-car one in the same fashion.
Over the 7 years I’ve used TT live traffic I bet I have saved at least a week of my valuable life not sitting in traffic but needless to say not all traffic jams are avoidable.