I have owned six different Lowrance LCX series on the last two boats I owned.  Love the software and never had a problem with display heads. I hate the transducers.  They work fine for a while, but I never had a LEI Ducer last more the 36 months.  I operate about 300 hours a year, mostly offshore.  Replaced the last ducer with a P66 Airmar and it was the bomb, absolutely outstanding.  Right now I am fitting out the Canyon Draggin.  Just installed the LRA 4000 open array, looks like I will be installing the new HDS10 next month with a 1kw Airmar through hull ducer.  I have had both GREAT and bad experiences with customer service.  On the good side,when I had problems they shipped me ducers over and over, no questions asked.  I shipped the broken one back and they always confirmed that it was the ducer that was bad.
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I also have used a lot of Furuno gear.  Cant go wrong.   Not a Garmin Fish Finder fan, not as good as others.  Never used or owned Ray stuff.