Upgraded from the D300 to the D750 in 2016 and have had zero issues. Great camera, especially in low light. Much better than my previous body.
I got my D750 in last years holiday sale. Came with the battery grip for something like $1400. Unless you are in a hurry, good deals may be coming.
Oh, and no problems with it doing many pro sports events were it doesn't get treated well, traveling by plane, sand at the beach and general hard use. I'm super happy with it.
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