Pros: amazing soundstage, homogeneity
Cons: nothing to complain
To make it short:
Get one if you find them, the EX1000 are Sonys best inears, maybe for a longer time.
Use a fitting player that can handle the impedance, and you get breathtaking results.
One of the very best soundstages I ever heard, no BA comes close to it.
Frequency response ist good, highs can be sometimes 'special', but it is not a big deal. IMHO it's more problematic if the player is sensible to the slight impedance peak around 5 kHz. Try it out. Also try different eartips ... but you know, for sure.
Some people say, the EX1000 is close to $ 1k customized BAs, and so I do!
It's a real bargain now, and a shame, that Sony discontinued it.