these are my thoughts of 334 since u interested in getting one but havent listen to a pair before
the mid bass of the 334 made the music seems a little unnatural to me.. maybe its cause of the genre i listen to.. i listen to live, acoustics, jazz ..
the bass of the 334 is good but lacks the timbre of instruments
also is the cable which is much more difficult (the stock cable is much stiffer) to manage compared to the typical ES2 cable.. and aftermarket cable which i tried like the SXC24 by ALO Audio will curl into a mess and will retain the curly shape after some use even when u try to straighten it
another issue will be warranty issues, though built like a tank, no one can predict when they do break down.. and most 334 you see on sale on forums right now, MOST do not have warranty anymore.. there was a period where it was OOS everywhere as it is now and most on sale are the stocks prior to that..
also, buy it only if u really like it and not for the sake of owning the hype and exclusivity , for that price you can pretty much buy almost any iem out there.. if your issue is that you prefer a universal.. you can also buy almost any universal/demo fit of any customs out there liao.. like universal JH13PRO FP, etc etc.. or maybe top up a little bit.. with that kind of price that 334 are going for