SS's are great, geared bikes too, there's room for all of us quirky folk out there without 'dissing' each others riding preferences. If you don't get it then perhaps try it before nay saying. There are those who try it and never look back and of course there are those that just don't get on with it. Each to their own.
If you're strong and fit you'll be used to going for it on the hills and not twiddling away in the granny gear. Usually you'll be at the top before the geared guys.
Slow on descents? well, hardly any. My top speed on my geared XC bike down one of my favourite hills is 49.9 mph (just couldn't spin any faster to drive the back wheel that extra 0.1 mph!) I've managed over 46 mph on the ss going down the same hill (36:16 ratio).
They're cleaner looking, lighter (usually) and simpler than geared bikes, pretty easy to maintain too.