I really do not like the Shure Olives on the HJE900, makes the sound very muddied and boomy...
...For me, I find that the 'ultimate' tip is the UE single flange, they are firmer than stock / Sony etc, which help to provide a better seal, and a slight warmth to the sound...
I am sooo tempted to start a different thread about these, comparing them to the likes of the Senn IE8 / Denon C710 / JVC FX500... What I can say as an ultimate summary is that the HJE900, when fitted properly, and with good source synergy (which comes in spades with the iPhone 3GS!) have the cleanest, sweetest sound that I have yet heard from an IEM...
...Sure, there may be better out there, especially when going to customs, but for a relatively cheap set of canalphones (compared to the customs at least), the whole sound is just 'right', vocals are to die for, and the cleanliness of the upper ranges... wow! - it makes the Denon C710 (by example) sound wooly throughout all frequencies, and even the well loved FX500s sound slightly nasal in comparison...
For $110, these are quite possibly the buy of 2010! - Even at full MSRP ($249) I wouldn't complain at paying the price...
Just remember if you do pick up a pair, make sure you burn them in well (they don't sound 'stellar' out of the box), and have very careful tip selection - these, more than any other canalphone I've had, are very picky about the tip selection, but - once those two factors are sorted out, prepare to be wowed!
...Hey, don't need to do a full comparison now, you already know my verdict