I am using Wagon R for long now, When i bought it , all my family members told me, if i would have chosen a slightly bigger car. I am so happy to see the new Wagon R grown in size now, Maruti did a good work here with new 1.2 ltr engine fitted for better experience.
Pros
I started loving the car more after two years of using it, the maintenance was low and it provides good fuel efficiency, i am getting around 14 Kmpl in city and ~17 Kmpl on highway with AC on. It provides good head room, driver view, essential features are there like all power window, power adjusted ORVM, Audio system, AC, rear wiper and defogger, fog lamps etc. Overall a good car for long city drives with 4 passengers. Very easy to park and navigate through crowded streets because of its tall boy look and size.
Cons
The AC is not upto the mark with 1.0 engine, crammed space for 3rd passenger in back seat. The boot space is very less even for city usage. The 1.0 engine lacks power at high speed. The ride quality at back seat is not good w.r.t to equivalent cars like i10, Tiago etc.
But if your maximum usage is for official purpose, this is a great car to have.