So compared with everyone here, this is really not that impressive... however...
I recently paid off my overdraft in a month (after finding MMM, various other related blogs, YMOYL) and started saving. This month I got hit with a ton of unexpected expensive things - all good things (birthday parties, prezzies, a camping trip), but my initial reaction was 'oh fuck, I can't afford any of this'.
This is a familiar feeling. Pre-mustachian I would have wacked it on the overdraft and tried to ignore the feeling of latent panic and night-time sweats.
Now, I just need to drain my savings account a little bit. And that's ok.
It's a very, very good feeling to have this little stache.
So I just wanted to say that. This whole thing totally works. Life gets better pretty much immediately :)