As of two days ago, I'm celebrating one year of tracking my net worth (etc.) in Excel. (Tried Mint, but I prefer the ultimate control of using a spreadsheet.) Not sure if I started before or after discovering MMM, and I was already pretty frugal anyway, but this has definitely been illuminating. The actual numbers aren't very impressive, since I'm pretty young, my income is low, and I live in an area with high cost of living...but my 'stache is definitely growing, even if it's not growing that quickly.