Sadly, you just missed (by about a week) a killer deal on newegg and amazon, in which the X10 was being sold for under $200. That being said, most IEM-wearing Headfiers agree they are excellent phones for $200, but not really worth the $350 MSRP, especially considering that Sleek SA6's (currently at under $200) offer similar SQ for considerably less.
On the other hand, whether or not something is worth its asking price is clearly a subjective matter on an audiophile forum, so what you could do is buy them, try them out for a week, and return them if you don't like them.
However, keep in mind that at $350, you're starting to flirt with the price point of SE530's and TF10's.