This is my opinion only. Having had in the region of 30 bikes in my career, I bought the cb500f today (candy orange) part ex cb650f 2015. I am going to give you it's merits accordingly. Looks like a 600 feels like a 125. Motorway cruising no problem at all. Overtaking in top gear capable but not ballistic. Drop it down a cog and it will pass with urgency. Very stable not affected by passing big vehicles. No twitchiness at all. Back road Twisties super flickable not intimidating at all but it get gets a lick on if you use the Rev range. In fact It will give you 600 feelings for a very short span in the revs. Brakes surprised me how good they we're. Bars suited me a treat. Seating position spot on especially with your bum touching the pillion seat. No sliding forward down the seat either. Final thoughts, think and it turns in, economical, so easy to ride, doesn't sound too much like a twin, minimal wind blast at motorway speeds, super duper slick gearbox, if the 2019 bike is better it must be good.