I felt today that i have to write down at least my opinion of these iems after 4 years of use since i already miss them ( cable got teared ).
Coming from someone having layla II, kse1500, and se846, previously owned layla I, this iems is my most favourite, best purchase in terms of price and quality, and the serivce provided by sennheiser.
1- Most favourite : ease of use, light, no fatigue, and more than decent sound quality and signatur3.
2- Price & quality: it is consider cheap and accessible by too many yet enjoyable and wouldnt let you down. Not BA drivers which is something actually is good if u ever had tried ba drivers based iems. Isolation is not impossible however it is difficult to obtain. Detachable cable which is something we sbould all appreciate otherwise i wouldnt have kept it till i get a new cable.
3- Service: they are very responsive, first ie80 i owned had driver failure and got replacement within 1 week. You can check if it fraud or not using the code provided for newly purchased products from Sennhieser.
Fast comparison in terms of quality with Layla:
With this price 3k USD the cable got teard essily less than one year. Ie80 4 years of Crazy use and abuse and recently got teard.
Driver failure from Layla waited 3 weeks or so, with this price you gotta expect more carefully engineered iems.
Sound of course layla beats it and isolation is much more easier, but ie80 will be loyal to you forever.
Thanks