Okay, so we know you are painting something made out of aluminum.....the question is WHAT???? You are showing us what we call "rattle can" or what I call hobbyist paints here. Fine for interior art work, nick nacks around the house, etc. So, what's the project?

"are they of good quality and durable" ahh...hmm it depends on what its used on that's why he asked. i'm not sure what you mean by metal finish from flat. you need to be a little more forgiving with your information. your lucky DarrelK offered to help most on here don't like to give any advice to someone using shaker cans.
Jay D.

Krylon paints are ok, possibly one of the better retail brands.

But.......

None of those will work long term on aluminium without a special primer to bond to the aluminium. At the very minimum an etch primer or a more specialised aluminium treatment. Either way, the surface needs to be sanded immediately prior to painting so you're not painting on to aluminium oxide, which won't stick.

Knowing the application will help in recommending the right primer and treatment so that your job has a reasonable chance of being able to last.

Yeah, we are not trying to be "nosy" here but "what" you are applying this to or to be more specific the "environment" that it is expected to perform or last in is everything. The very fact that something is canned in a shaker/rattle type can usually (not always) indicate a thin or low solids simple 1 k (not a chemically hardened) material. Again something decorative that's not going to be exposed to the elements could hold up for many years inside. While an auto, bike, cycle, finish might fail (especially without proper aluminum compatibility) within weeks/months of the application.....

If it's just a computer case I wouldn't be over thinking this that much. Most of your rattle can finishes are just going to be low solids lacquers. That last product for instance is 20% propellant gas (used to atomize and push the product out of the can), about 56% solvents (thinners used to keep the solids in suspension and establish drying once sprayed, and what little is left over (24%) is the actual solid "dual film" consisting of the solid ground pigments which will make your coating. So that 12 ounce can yields a whopping 2.88 ounces of dried paint film..... So spread that out over an entire computer case..... and you just don't end up with much coating..... How long will it last? How strong will it be? Will the heat from the power supply affect it? Don't know, just get some paint and start experimenting......