I absolutely agree with Beverly.
Sugar syrup has a much different pH than honey, not to mention it lacks a bunch of vitamins, minerals, etc. A high school student here in OK just did her science fair project on comparing the difference between feeding bees honey, sugar syrup, HFCS, etc. She concluded the gut of the bees fed only honey were much healthier than those of bees fed the other stuff.
I am a BIG believer in keeping back as much of the hive's honey stores as possible to be able to avoid supplemental feeding with anything but the bees own honey. Of course, occasionally you are going to get in a dearth, bad weather period, etc. where feeding becomes absolutely essential to keep the hive alive. But I believe healthier bees is the first and best line of defense against varroa, AFB, etc.