I have WagonR, at present 16k+ on odo, there is no noise in my car Alhumdulillah except fuel pump noise but it is not that loud and usually occur when tank is more than half full, you cant hear it when audio is turned on or you are in traffic. Wagon R is the most quietest car of Pak suzuki ever produced.
Some good features it has which make it better choice is its AC, car is cold even on hottest day, it is comparable to 1300cc car. Engine is smooth as silk, very quite and powerful, K10b produces same horse power as of Vitz engine. Wagon R is spacious, inner plastic quality is again best among Pak suzuki cars. Wagon R is among most fuel efficient car in market 14-16kms/l with 100% ac in city traffic 16-18 kms/l without ac, highway mileage are even better as it should.
I can safely say it is the best car by Pak suzuki that is produced in Pak.
Some negatives now, WagonR has Body roll, every tall design has it, WagonR still quite stable on well paved road and less windy highways or normal windy conditions. I have tested it in windy condition in Karachi on open roads, you do feel air pressure on cabin but if you drive under 80kms/hr then even in heavy winds it is very stable.