my opinion after building in lots of cases ranging from high end to low end?
the corsair 540 is average in terms of build quality however i thought it was pretty impressive in terms of what it offers for space and cooling.
i wasnt all that impressed with the fractal r4. its not terrible but not great either.
for about the same price you could get a corsair 750d which in terms of build quality puts both the 540 and r4 to shame.
i thought the phantom 530 wasnt terrible in terms of design and liked that it had many large fans however build quality was subpar to all of the above. the plastic front doesnt even match the color of the sides.
i wasnt too impressed with the corsair 200r/300r/400r/500r either. while definitely not bad cases for the money they cannot compete with the 750d for build quality.
i'm currently using the 750d case right now on a trial run (thinking about replacing my much higher quality 800d with it) and its not bad. a few things i dont like but overall not a bad choice and building in it is pretty straightforward. decent airflow, grommets, modular drive bays, lots of ssd or 2.5" drive storage slots and its wide enough for big cpu heatsinks. only thing i really dont like is how the cd drives look installed (if i keep the case i will be modding the front drive panels to make a hideaway look)