I know what you mean about turning the clock back. My first big bike was a Yamaha FZR600. I loved it at the time, anyhow got the chance to ride one again recently and it was awful narrow tyres peaky engine and rubbish suspension compared to the modern stuff
Back on topic I haven't driven a 1.5 F56, but did have a listen to one at the dealers and I thought it had a lot of character.