I have a G1000 turning my KT34XA.  I have had no problems with it at all. 
I did break the mast clamp while installing it (a common failure), called
Yaesu and got a new one for free (without asking!).  Never did install it
though.  The broken clamp seems to do just fine.....
survived 100+ mph winds, ice, Steve K7LXC (  ;-)  )
I heartily recommend it for the average installation.
Gary K7FR
PS  Also have a Ham IV that is 25 years old and never had a problem with it
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