Garmin 66i any good?

Hi, I have the opportunity to buy a second hand Garmin 66i, complete with nz topo maps , firstly are they any good and secondly what is it worth?
I have an old Garmin Astro that I used to use tracking pig dogs but want something with a bigger screen and in built inreach, although I have an old inreach that works fine.
Appreciate feedback and advice please?

I loved my 66i until the battery failed on it haha. Did you buy the 66? Garmin gave me a brand new 67i under warranty, which is currently for sale. Apparently a whole lot better than the 66 model