I used it too, the "neon" one. I was using threat plates for a while, but I can't get it to show the HP percentage so I went back to the neon. I've had no issues so far.
What graphics issue are you having? Everyone once in awhile I will get a "Interface failed because of Addon" message, but I can't consistently recreate it. Is yours happening in major cities, when you click on someone, or no apparent reason just having issues?
Could start by enabling each addon one by one, or turning your settings down and then slowly bring them back to where you had them.
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85 Goblin Mage
MMO Experience: UO, EQ, AC, Doac, AC2, FFXI, WoW, Rift