GL: Cmap Max Wide

[Ralph Yost]

Have any of you Loopers used the CMAP MaxWide charts? They have one
(W73) that covers the entire East Coast and the Bahamas, plus a good
part of the Gulf of Mexico and Canada. Another, the CF2, also includes
the Great Lakes. It looks to me like it covers about half of the Loop in
one chart. I would like to hear from others who have used this map chip
and some suggestions on where to buy it, even a used one. 
My chart plotter is a Standard Horizon CP1000C plotter.
Thanks 
R.