Humminbird 597ci HD GPS Combo being discontinued?

I've been running one of these when they first were released with down imaging and just now starting to get the hang of it. Now I am rigging a new (to me) Revo, and considering of just buying a second 'Ducer and power cable to switch the head unit between 2 kayaks. I see they are now listed as being discontinued (and great pricing). Anybody know why these are being discontinued? I'm assuming its because of something newer/better is out but I see the 598 side imaging unit is being discontinued as well, but the 688ci HD DI is not.

I think they discontinued it because a lot of the units had issues with positional accuracy which throws off the speed reading.

-Spot-

In fact it looks like the whole 500 series is being discontinued. I wonder what makes the 688 any different? It's nearly identical and costs is just a little bit more.

I believe the 700 series is being discontinued as well.  I bought my 798ci just before it made it to their "Legacy" web page.

Companies ALWAYS discontinue product lines. What was up-to-date technology a few years ago can be produced quicker, faster, and more cheaply with new tech.  It is called "The Product Cycle".

Having two identical head units is a good idea. If you like your current unit, and the price is good, my suggestion is buy it.