I bought this for my 3 year old niece, for christmas.  She loves pretty much everything these days, but that doesn't take away from the fact that she loves this doctor costume.  She immediately wanted to put it on and pretend to check everyone's reflexes and heartbeats, and to give everyone injections, etc.  She wanted to play with it right away.

The only problem I have with it is that the stethoscope doesn't stay on when she puts it in her ears.  She has to hold it on, which makes it more difficult to actually use.  She doesn't seem to mind all that much, though, so I guess it isn't that big of a deal.