First of all, The delivery was very quick, arrived within 3 days.
The filters come already in the case, and screw into my lens very easily. I am using the kit EF-S 18-55 IS canon lens that came with the 550D. No problems there then.
They do the job really quite well. I am pretty new to DSLR photography, and don't want to spend a large amount of money on a macro lens. For a fraction of the price, these perform well, giving sharp images very close up.
However, the description claims you can double them up as they are double threaded. This is true for the +1 and +2 filters, but not for the +4 and +10. This because the front of the filters are dome shaped, so the larger magnification, the larger the dome. So much that it protrudes in front of the thread. And I really do not need the +1 or +2 filters, as do not provide much effect. So if I had the chance to just buy the +10 filter, I would have.
Also, while the 'free' filter case looks good, the inside is not very padded, just having a mesh material between the two sides the filters could easily be scratched on one another.
Overall, they do what they say on the box (ish) and perform well giving great results, I will upload some examples above. You get what you pay for, so if you keep your expectations low, you will be happily surprised with the outcome.
I would recommend this product as they are perfect for beginner photographers looking to try macro photography, but if you are serious about protection, buy a proper filter case as well.