Power to 'em. If they have the money to do it, it don't bother me...
Nighttime power will remain at 5 kw.
The 20 kw may help distant DXers during sunset or sunrise skip.
Not sure how much the 20 kw will expand their present coverage area, but acc. to RadioLocator their present daytime coverage at 5 kw isn't quite as good as their nighttime coverage, so I'm sure 20 kw will expand their range a bit.