After fawning over them and reading everything I could, I bit the bullet on a pair of 846's after having a pretty great december for myself. Quick impressions below, but some background first (which leads to why I bought the SE846, which may help those undecided):
Triple fi 10 was first BA and high-quality IEM I owned. Loved the details, had some decent bass, but wish it had a tad more and that veil over the mids was killing me. My brain had to burn in every time I put them in before I would stop caring about the mid veil. Very V Shaped. Sold them later.
Bought the new beats studio. Love the comfort level and the fashion level of the headphone. The bass was great, and they sounded pretty decent overall. Some sibilance in the highs and a bit of shrill in the mids prevented higher volume levels. They are just fun and easy to me, simple as that, I try not to be critical of them and just enjoy tunes.
Bought the UE900 S to get another IEM only a few short weeks ago. Despite having two low frequency BAs, they lack punch although had pretty good bass extension. Mids were better than TF10, but still for my tastes still sounded veiled to the point where it was very distracting. Excellent detail retrieval, good sound staging and just the right amount of higher frequency sparkle. A solid U shaped IEM, but lacking to my tastes.
What I have found out: I am a basshead, I love excellent sound staging, good mids are more important to me than high frequency detail, which I find can be fatiguing. You find this by using more and more equipment, which is kinda fun.
So, I found out about the SE846, read the reviews, read basically this whole thread and it sure fit the bill for what I was looking for. Sold some gear and bit the bullet. I got them this morning and I've got to say I am EXTREMELY disappointed.......Not because of the earphones or SQ, au contraire, but because there is simply no going back down the ladder.......I've tumbled down the rabbit hole and kansas has gone bye bye.........These have got to be the best sound I could possibly ask for!! I find that it may be torture to let friends listen to them in the future if they have no intentions of buying a pair because it will screw up their listening experience with other headphones severely.
I'l be posting an "official" and in-depth review later and am working on making a video review of these (since there seem to be so few of them apparently).
Also, because I bought these, I decided I need to upgrade the source and SQ across the board. I now have an AK100ii on the way, which I will also review here and on video. My ears are in love, but my wallet is absolutely hating me.......