There's actually a dedicated thread on it I think.
But end of the day, as with all things hi-fidelity audio, its really where you think your maximum spending is set at. Its a pricey IEM, but there are those which are like 2~3x its price and nothing seems to have a unanimous praise even at those sky high prices.
I think playing and experimenting with budget earphones is a whole lot more exploratory and in the process, its more fulfilling a journey in understanding our own wants and needs out of audio equipment.
Heck... the price of the IE800 is probably still more than all the different models that KZ has produced since DAY 1 combined !