My daughter is 20 months and I still use it sometimes. I ALWAYS use it for airplane travel though. A lot easier to just strap her on and not have to worry about her getting lost or whatnot... she's a Houdini at escaping from her stroller. That said, I don't think I'll be getting rid of it anytime soon... especially when we're planning on more kids.
Oh, I have the Pikkolo and not the Ergo.