The motivation behind VXR is that if you were planning to buy a WagonR, now you can add another 1.5 lacs and get a much better looking car. Features are pretty much same in WagonR VXL and Cultus VXR.
I checked out Cultus VXL when it was launched. The body seems to be made out cooking oil tins, doors seem so chinese they don't shut properly, you really have to bang them hard.
You if you are upgrading from mehran or alto you probably won't feel that things are so bad.
But for someone like me who drives a Civic and recently got brand new City, you'd have to put a gun to my head to make me buy a Cultus VXL while Honda City is so much better of an option for another 1.5 lacs. The difference in price is not that much but the difference of performance, handling, driving and build quality is like day and night.