I took the test ride of GS 150 r two months ago. I find the bike look like a big monster and ride was like feather. I loved this bike even after taking the test rides of apache, pulsar, unicorn. And I have purchased it last week.
Positive points -
1) Big bike feel when you ride the bike.
2) Engine is too smooth.
3) Fuel consumption which I got is 52 in first 250 kms.
4) Its very comfortable to ride and have a good balance.
5) Digital technology is awesome, like digital clock, economy and power . Also the small indicator which starts blinking if one rides in an odd RPM.
Negative points -
1) Its new to market and not a hero honda bike which gives a good resale( but I was sure that I am purchasing the bike to use it and not to sale it:))
2) Its tall bike, people having small height may have a bit problem.
3) Initial pick up is not as good as apache, pulsar but the bike has got the power after the initial pich up.