I picked up a fake pair, as well, from ebay last year sometime. Sonic bliss is what I encountered. I couldn't believe how spacious the headstage was. I was so impressed that I imediately bid on a few more before and won.
I knew they weren't authentic, but figured they were just a gray market product. Since they sounded as good or better than most every other iem I had listened to, I doubted they were really "fakes."
Only after I had three pairs did I listen to one of the Stereophile test discs.
The spaciousness was due to them being wired out of phase. On top of that, the left/right was wired backwards. This I knew early on so I just swapped the L/R in my ears and they really never bothered me.
I rewired them in phase and they still sounded great. I quit using them at some point for some reason.
Never thought to try different tips. I guess I'll try that now that I'm thinking about it.
Oh, I remember now why I quit using them: Through the iPod Classic and Arrow amp, they sounded absolutely wonderful. Then I got curious about the Oppo DAC/amp through an iPod Touch. With that rig, the iem's lost their magic. Weird, up until that point, I pretty much consided the fakes my end game iem's.
I should have known better. This is Head-Fi, after all, which means there is no such thing as an "end game".