i have AET07 and tried with Spring 1 too, mids become much more clear with more details (on already very very details IEM) too bad i seems sometimes couldn't get perfect seal, so i need more time to deal to have perfect seal. Wish they come with LL size since L size a little bit small to my ears. and about KB100 yes, they are very incredible, and Spring 1 is an upgrade to KB100. My review will come out in few days bout this. Writing up a full review about this special Spring of the year.