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They work great. I have been using that exact gun for about 4 years now. I purchased mine at Harbor Freight tools, but it is the same gun - Chicago Electric. etc. The kit pictured has everything you will need to powder coat, other than some razor blades for trimming tape and an oven. I purchased a used electric kitchen oven which serves the purpose nicely.
The seller of that kit, Columbia Coatings is a good source for powders, Their powders IMO are better quality than the Easwood/hotcoat powder. Eastwood does have some colors that Columbia does not.
I have a similar kit and have to say it works fine. There's more to powder coating than the right gun, prep and spray techniques and a good oven are equally as important if not more so. Of course good powder is important as well.