I still love mine and feel that outside of the IE8, and maybe even those, there isn't anything out that is enough of an improvement for me yet to need to upgrade. Maybe the SA9 when it comes out, possibly the CK100 when more well known and available for a reasonable price, and maybe the next UE dual driver or Jays product(Peter said something is coming in spring and the only thing they don't have is a triple driver phone).
I only tried the Comply foams but find they veil them as do the stock silicone tips. I use ebay clear dual flange tips and they improve the phones clarity separation and speed/crispness. Less bass but better bass and detail overall IME. Quite close to the Phonaks which do share characteristics due to both using top-fire armatures and the better tips bringing more clarity and detail to the 5's which are a bit smoothed over even a bit dull with the stock tips. I also get more improvement with my S-adapter unamped since the Phonaks are a harder to drive. Of course there is the soundstage that competes with everything out there and the comfort/great cable/ease of taking in/out(only bested IME by the UM2; I like the UE cable better actually). The mids are among the best out there also.
They are down to $130 now and are a nice value and for an extra $25 for tips and a little impedance they are near the top of the heap for those who like a more neutral sig. I had my 5 for the longest now. I only kept the ER4S for 5-6 months only kept the Triple.fi for <1 month. I find that paired up with the right tips/75 Ohm adapter and a Nuforce Icon mobile they are giving me really high end/headphone like bass, wonderful mids and the amp gives them the added treble extension the 5's lack. I'm sure that some would do better to work with a warmer amp, I am happy with a nice balance. To me, I got the right amount of punch and impact etc. in the end. If I started with more bass like an Atrio/UM2 or 3/Monster etc. the end result would be a bit too much color for me.