I owned a pair of TF10 for 3 years.
Love the detail and shining treble, but really like the voices be more forward.
After some audition (that's the good in Taiwan! one retailer even has a WALL full of IEMs for audition lol), a pair of MDR-7550 is in my bag now ;)
As for the myth between EX800st and MDR7550... the shop I bought this actually has both for audition.
For me, their looks are identical (except the model number of course), and the cables are identical tool.
However, the EX800st sounded emphasized more on lower bass than the MDR-7550 for me.
So, at least for my audition, these two sounded different to me.
I liked the 7550 more than 800st, and 7550 is cheaper (~210 USD) than 800 (~280 USD) here, so 7550 is my choice.
7550 is much more balanced than the CD900st (yeah the retailer has it for audition too).
The latter emphasized on the mid, great for voices but the background is too recessed for me to enjoy.