I'm wondering, how's the Havi B3 Pro1 today compared to the new generation iems under 100dollars?
I won't be able to answer directly as I haven't heard Havi B3 but I've seen a bunch of comparisons with HiFiMAN RE400 - they are quite comparable. I think that re400 is still one of the best <100$ IEMs so...
Modern IEMs that we are talking about here have a lot of potential but rarely can they compare long term with standard good budget IEMs. They sound impressive at first and then they show weaknesses the more you listen to them, where re400 for example won't blow you away but they will always sound good as there is not a lot of makeup to peek under. Most of this is, I believe, due to a high number of budget hybrids that have potent BAs that they just put in the nozzle without much consideration (and only some of them end up being somewhat good in the long run).
As far as I am concerned, I'd take Sony MH1c or re400 over pretty much all of the IEMs that we are talking about here (TinAudio T2 being the exception), but this thread is golden because the future is here, we can all feel that big things are coming our way - by professional tuning or by chance, take your pick.