Sonofsven, You've bought ceramic knives from Harbor Freight before? Or you've had other ceramic knives and this time you found some at Harbor Freight?
I have one that I bought for about $20 (not HF) about 8 years ago and it still cuts decently well, but not as sharp as our other steel knives that I use a $4 sharpener on. For a while, the ceramic knife was my go to, but I'm just not much of a fan anymore since getting the cheap sharpener. I also tried sharpening it on a diamond grit tool I have, but its too coarse and just seemed to make the edge jagged.