I did on my 1197/998 units.
I was on the water for about 8-9 hours fishing with the new 6.600. The 998 had some glitches.
http://www.bbcboards.net/humminbird-sonar-gps/336721-6-600-998csi-issues.htmlI did not experience the 998 sonar glitches on the 1197. I have reserved judgement on 1197 sofar, need more time.
Major 1197 issue I observed was the 1197 crashed when I was diagnosing the 998 and switch the local 998 HDSI transducer to use the 1197's HDSI transducer via ethernet.
Minor issues:
1197 paused(hung for a time) when switching screens thru the Bird's-Eye View screen.
All 1197 Menu buttons were unfunctioning when I was reloading all my Navigation Data from SD card. So during the NAV Reload I was locked-out from the unit. New design feature or software bug???
I have 300+ WP's, numerous tracks and use Grouping, so took a few minutes for the unit to be available.
I thought DI display was improved. SI was same or maybe a little blurry. Sonar intensity seemed a little higher, so I reduced to a 7-9 rather than a 10-12 setting. All at 455kHz. I forgot to test 800kHz(wished I had).
Still have 6.600 on both units.