Paul,

I can't see that WAAS is not here to stay. But the 430/530 will support
WAAS, too.

Some dislike the operating of the CNX-80 and find it more convoluted
than the 430/530. Some love the CNX-80 for the ability to enter airways
in flightplans.

You might want to read the articles Aviation Consumer published on
this.

One problem I would see with the GX 55 that it is for sure an orphaned
unit since AFAIK GarminAT has announced it will be discontinued.

--
Thomas Borchert (EDDH)