Absolute personal issue you have to answer yourself. I just did the same thing. Sold my '05 GSXR1000 and '06 ZX14 (And a whole slew of other ones prior to that.), and got a M109R. So far, so good. Still a high-tech., smooth, powerful bike, but nothing like the sporties, especially in the twisties. It'll make you slow down and relax.
Now, to see how long it'll last. That's the question. Good luck.
Now, to see how long it'll last. That's the question. Good luck.