Well, I am 5 yrs older than you, and rode 14,000 miles on my GSXR600 in the past 1.5yrs after having rode the FZ6R for 8,000 miles in 6 months. The ergos are not painful, but they can make you squirm in discomfort after the first 30 minutes. My typical ride is comfort the first 30min, discomfort the next hour, then acclimation and nirvana for the next hour, then back to discomfort for the next couple of hours.
I just ignore the discomfort cause I love being outdoors and riding this type bike, it all boils down to your threshold for pain and pleasure, most our age just aren't willing to be that uncomfortable for the little increase in speed and corner aggression, don't buy it for the looks, that part of the SS ownership experience fades in just a few months, and it essentially goes back to all about riding.
The one thing I realized early on and still experience to this day, is that SS bikes challenge you, you push them and seek to go deeper, you mostly fall short of cornering perfection, but constantly seek it. You are forever in the quest for the perfect corner, SS's handle poorly on tight slower turns, you often back off entry speed and loose your gyroscopic effect, the FZ6R steers much better on these type turns. On sweepers and open roads, though, you can haul ass and work your body positions, and push a bit more. The 600SS doesn't beat the FZ6R at normal take off RPMs, and only pulls ahead at the top end, so that's where you go exploring, and you will find the experience exhilarating, but also you will be riding very fast, these race engines like to be reving hard.
If you have any doubts, then make sure you get a killer price, that way you can resell it without a significant loss. But, I agree with JSP, these bikes are all about the back roads, riding them in traffic and around town is frustrating, there is more back strain without the high speed winds holding you up, and you just kinda want to get off when slugging around town. But, if you want to do the bike night and Starbucks kinda thing, I don't hate on that, that type rider doesn't offend me, but I think you are missing out if that's all you do with it.