IEMs that stand the test of time

I am writing this while listening to my beloved Cadenza4's after quite a long time. In the last months I spent most of my listening time auditioning the IEMs added to the store, like the endgame Unique Melody IEMs and many others.
A thought dawned on me, what if I won't like listening to the much cheaper IEMs that I adored at the beginning when I just started, so I decided to spend the next week listening to my favorite IEMs from the past.

To my surprise and delight, the IEMs i loved before, are pretty much still great to listen to! Spending more money won't make cheap IEMs obsolete, you just pay for more details, more refinement, expensive drivers like bone conduction, and sometimes special tunings like the UM Mest Fortune, that can only be achieved (for now) after a lot of research and know-how.

Letshuoer Cadenza 4 — musical, vocal-forward, easy to live with

Now to get back to the Cadenza 4, I love this IEM because to my ears it sounds very musical and engaging, without relying on deep sub-bass or sparkling treble, but on a rich vocal presentation, wide soundstage, a bit of warmth, and enough details and clarity to keep the music alive while having a comforting listening experience. Definitely a must try for singer songwriter playlists.

FatFreq x HBB Deuce — the bass set that doesn't play it safe

Next on my list is the FatFreq xHBB Deuce simply because it is FUN! Every time I am in the mood for some old-school Hip Hop, I always grab this IEM. It has such a bombastic sub-bass that very very few IEMs tried to replicate, because simply most brands play it too safe and want to sell to the broadest audience. 

Hisenior Mega5EST — the one I'd keep if I could only keep one

There are many others I want to mention, but I don't want to drag this along, so I will end with the one that I will bring if I only had to choose one, the Hisenior Mega5EST.
It is the first IEM I heard using the electrostatic drivers, and I have to be honest for the first days I really didn't understand why it had such great reviews. As many people just starting this hobby, getting the perfect seal from your ear tips is not so straight forward, but this set REALLY needs it.

Gladly I didn't give up, as I just received a new set of ear tips that were supposed to create a perfect seal on any IEM, the AZLA Xelastec, I put them on and I was instantly blown away by the airy and sparkly treble. I am not a treble guy because I get tired easily if the treble is too sharp, but in this case Hisenior managed to create a well extended treble that is sparkly but soft at the same time. And because the bass and the mids are also very well executed, this is a refined daily driver I would recommend to anyone.

What I'd actually take away from this

In conclusion, my advice is to look for IEMs that are created by people that care about their craft. Don't follow the hype, look for the passion.

What are you favorite IEM that you still hold up for you even today?