There is not much use with a digital meter for the S version.
Does a digital meter help you drive better and safer than a normal
meter ? If you want your VIOS to look different, nobody will know
that you have a digital meter unless they look into your windows.
The only tell tale sign of the S version is the letter S at the
back of your car which nobody bothers nowadays.
In summary, I don't think it is worth the money to buy the S
version since the 'cosmetics' for Vios is already in the Deluxe
package. 