i've it's grandad - an FZ20. if it's anything like mine - go for it you really won't be dissapointed.
it's best feature is the lense, mine is 12x optical which is the equivalent of 430mm in 'film' terms. full f2.8 operation at that, so lots of light too. good optical stabilisation (antishake), you can take handheld full zoom shots. pin sharp at full zoom, 5mp, 4fps burst. good enough for a half page shot in a magazine