Bought GS 150R in June 2013. This is my first bike. I was riding scooter earlier. Have absolutely no regrets about my decision. I am 50 years old and 6 ft. tall.
Its a very good bike with a smooth and vibration free engine. Does not have great pick-up like a Pulsar or a Yamaha bike. But if you enjoy a smooth & vibration free ride, then this is the right bike for you.
Its a bit heavier than other bikes in its class, but thats because its built solid and you do not feel it while driving. After some time, you get used to it and its not a big issue.
It has a good digital instrument panel with clock, trip meter, digital fuel display, gear indicator etc., many features not available on other bikes. Good fuel efficiency approx. 55 kmpl. Suzuki service is also good with the service center calling you to remind when service is due.
It is also quite an uncommon bike on roads, so people do look at you and sometimes ask questions about the bike.
Only issue is with the seat, which could have been a bit broader and more comfortable for long drives. Its also a high bike, so may not be suitable for short people.
Intending bike buyers should consider GS150R and take a test drive before final decision.