Here is my two cents, and hoping it is worth 3cents to someone. I didn't know that Harbor Freight had a pinpointer, but I am going to look to get one. I used to go without a pinpointer and realized that didn't work so well. The cheap one I purchased was an improvement, but...... Now I have a Sun Ray and love it for two reasons: It is powered off my detector batteries (seems to make no additional drainage at all) and I hear it through my earphones--don't have to take them off. Also, it has great range, seemingly a full 3 inches. I don't know what brands they work with but it is now married to my MXT with no discontent in sight.
I tell people when they ask me about detectors to buy the very best they can possibly afford. It does make a difference. But a HF detector is better than none, and seemingly better than most. We live near 2 HF stores, so I can return it within 30 days for a new one if I need to, and the extended warranty may be affordable and worthwhile if you don't live next door to one. Still, although I have never used a propointer, I love my Sun Ray.