Mine is currently 48/17. Hills aren't easy but I haven't had to walk one yet. And I also haven't topped out spinning on a downhill yet. Flats are reasonably comfortable but if I could pick a magic gear for me, I would go up to a 19T or down to a 46chainring. But for now, I deal.
I rode my tri bike this morning and the closest thing I found on there similar was my middle ring paired with my smallest rear cog on a 9 speed. Which for road riding would be way too slow for flats but for in town riding is just a shade too hard(for my liking). But I sure can accelerate fast!