Anybody have any experience with the Navionics Fish N Chip ?

I have a hummingbird FF/GPS with the intregal map which is next to worthless, my unit is compatible with the Navionics Fish n Chip but was wondering if anyone has any experience with this map chip and what they think of it.

No, don't have any experience with the Navionics chips, but I do like the Garmin Bluecharts maps available for hand held GPS's.  May even be a cheaper route to take than the chip.  To me the best part is you can actually do a lot of the prep work on your computer, like marking boundaries, setting way points and planning routes. 

Thanks, that'll give me something else to take a look at.