3.5 stars. I do find it pretty useful, mainly because, as it claims, unlike super glue or 2 part epoxies, you need not gold it in place very long (only 5-10 seconds, as claimed) to set.
The claim that it dries clear is also true.
As for strength, it's good, but of course nothing like the TV ads claim.
It's properties (strength, adhesion and clearness) are about equal to super glue 2 part liquid epoxy - only, no mixing, and sets faster (super glue takes 30 seconds to set, this only 5-10).
So yes, I do like it and would recommend it for the right purposes. As for fixing anything, haha, of course not.
I first tried it on 4 pairs of broken eye glass frames. It worked pretty well on 2 of them (where the break isn't in a place that takes a lot of tension), but failed on the other 2 due to the tension in the location of the break.
Still, it meant I was able to repair 2 pairs that I previously could not. So that's OK for me.
But the main attraction, for me, is the quick, controlled setting. So here's one creative way a way I now use it:
I use it to do an immediate initial bond of 2 things that I otherwise couldn't hold in place long enough. Then I strengthen the bond with high quality stronger 2 part epoxy, like marine epoxy, or JB weld.
These epoxy's take much longer to fully cure, making them too difficult to work with on their own, but thanks to products like 5 Second Fix as the initial holder mechanism, a new world of epoxy bonding possibilities become possible.
So there you have it - for some, like myself, it is quite useful. But if you're expecting a magical end all permanent bonding agent, in most cases, FAIL.
Here's another use I found. The UV LED diode is rather strong (compared to low end UV diode flashlights), making it pretty good as a pet urine in carpet locating device.
However, it should also be noted that the 5 Second Fix light design is pure LED diode, connects to 6 volts (2 x 3V batteries), without a current reducing resistor. That means that the life of the LED is likely not terrible long, because it's likely pulling too much current.
The reason it doesn't immediately burn out is because the used battery type doesn't output huge current. Still, with out a resister in line, it means it will consume the battery rapidly, as well as limited life for the LED lamp.
But I think all that's probably calculated into the amount of lamp usage required to consume the contents of the liquid agent.
So it's OK I guess, but means the light may be pretty much done when the liquid is used up. So that may be why you can't just by the liquid separately.
Note that I did not buy it from the website. It is now sold at local stores. I bought it at Fry's Electronics, in the "as seen on TV " section. The price there is $10 for a single pen (vs. the double one for $20 on the site), and being Fry's, it's easily returnable, etc.
Final comment is that if you want to stronger UV light bonding product, they are certainly out there. Look on Amazon and eBay or Google searches. But these commercial grade products typically run more like $40 (compared to this for $10).
Think about the dental adhesive for fillings that use UV light to cure. They are obviously much stronger than 5 second fix, but MUCH more costly as well.
So you get what you pay for, and as I explained, for $10 I do find it of use in certain situations as described.
Bottom Line: Yes, I would recommend this to a friend