In order, smokeyflames. I have had the Bang & Olfusen A8's, the Senn CX300, CX500, the PFE's from Phonak, the triple.fi's from UE, the IE8's, and now the Klipsch x10i.
I purchased the IE8's after I lost my triple.fi's. Not because of any recommendation, just because sometimes when I lose something, rather than get the same product, I like to experiment.
I had lots of trouble finding the perfect fit with them after a while. I tried everything...foamies in combination with silicon tips, upside down tips, triple flange tips, sony hybrid tips, etc. After a while, the constant changing of tips and the taking them in and out of my ear gave me quite the sore inside my right ear. Putting the phones in and taking them was extremely painful.
Also, during my run I had to replace them 3 times: Once, when the right side started to go on me. I got a replacement pair from my retailer, that I promptly took back again, because the casing for the driver itself was cracked. My 3rd pair, I had for about 2 months, when again...the right said started to go. It was then that I had had enough!
The salesman offered to let me try the x10i's, and right away...I was impressed by their clarity. Fears that I would miss the pounding bass were quickly allayed during an in-store listening period with these. Right away, I could tell they were nice and airy in the top, but with a round, succulent bottom end (it's always one of those isn't it?) that got my attention. The ease of putting these small IEM's in, and the long-term comfort factor, have definitely made these babies go to the top of my list.
Hope that helped?