I had reasonably good results with this product. It works OK on some materials, not so much on others. As noted, when joining dark materials where the UV won't reach the product, it doesn't cure well.
I think people also have to realize how it works, by creating a plastic material which bonds to the two pieces being joined. As such, it probably does not work well in a very thin coat, so it should NOT be used like super glue. Try to create a slight gap that will be filled with the product, and when cured it will bond to both sides. In other words, DON'T press or clamp the parts together too tightly when curing. Maybe this will help.
Bottom Line: Yes, I would recommend this to a friend
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