Having spent the last few months testing a wide range of headphones and IEM's, I purchased these without trial due to the reviews on this site and elsewhere.
The first thing to note is the comfort of fit. Absolutly 'A grade'. You forget you are wearing them.
The sound is stunning for this price range.
Bass - Tight and punchy, if a little understated it is more than present.
Mids - The UM1's forte. Piano notes which end 'prematurely' on other headsets are drawn out on these (I forget the term for this). Vocals are impactfull and yet do not drown out the other frequencies.
Highs - They sound good, they are not the best but you spend most of the time listening to the extra detail in the mids not to worry about them!
Detail is great, real definition between the instruments.
Soundstage is not overwhelming, but the music is no longer confined to 'in your head' - an experience felt with most budget phones.
Music genres used for the above: Acoustic Folk, Alternative Rock, Classical, Pop (MJ)
This is the only review I have written for a product purchased on Amazon so well done westone for such a great product and thumbs up to iHeadphones for such speedy delivery.