I finally got the SS bug this year and have added a SS MTB and Road bike to my stable.
For the last 6 months I dont think ive ridden a geared bike once.
My commute to work, although reasonably flat, is 13 miles each way and ive loved every single sped mile.
I honestly cant see the point of gears for shorter journeys now.
The feeling of beating a hill that looked daunting with only one gear far outweighs the pain of getting up it!.
Plus my fitness has gone to a new level whereby all of my riding partners can no longer keep up with me off road, especially uphill!
If you have naturally strong legs you will not regret keeping SS. The (lack of) upkeep through winter is such a big plus too.
If you have weedy legs, you probably wont enjoy it. (haters must fit into this category).
I honestly never thought SS would be for me having dabbled a few years ago and hating it. My current SS MTB was bought almost by accident I gave it a fair crack and boy am I glad.
Once your riding technique has altered to suit, its the shizzle.
I should add that geared bikes still very much have a place in my collection. Long road rides, very hilly off roads etc. Whats nice is they stay in good shape for longer as they get less abuse.