I got mine with a mic, so I could use it for video meetings at work. Totally acceptable mic performance. I would guess that the mic cable is more prone to failure compared to the one without the mic, I've had cheap hard wired IEM sets with mics fail on the side with the microphone twice over the years. However as redrol noted, they're incredibly cheap, so if they crap out it's not that big of a deal.
Plus the addition of like 10 sets of the filters is really nice too. I have been experimenting putting the Tanya filters on a couple of my sets.
Apparently the 10 set filter provided in the Tanya packaging is the same as that used in the Tanchjim Oxygen. Had a friend who measured them on graphs and he says they measure the same.
FWIW the filters possibly may be the ones also used to convert the old Hana (which was shouty in the upper mids) to the new 2021 Hana which has tamer upper mids. Those filters seem to be Tanchjim's secret tuning recipe haha.