This is a very funny idea that you want to see TCU and showers just starting on the ridiculously bad resolution
It is quite accurate in central Europe and we use it, combined with sat 24 , and it works quite well but mostly to delay take off or change routings, but not to circumnavigate cells as you do with an on board radar,
If you do not have on board wx radar meteox is a good tool to keep you out of trouble.