Here are some things that I've learned through the process of getting my ES5s that may help others in the future.
Rush orders:
* A rush order is extremely expensive (USD $212) but extremely fast. A rush order itself costs USD $150, base shipping is USD $12, next day shipping is an additional USD $25 per direction. Depending on a few factors (making carrier cutoffs, proper package marking, incoming mail load, etc.), if you ship it out on a Monday, you can expect to receieve it on either that Wednesday or Thursday.
* According to my Audiologist -- and very important to know -- is that if you place a rush order, in order for Westone to get it out the same day, the manufacture of the ear-pieces needs to be parallelized, meaning two techs are assigned, one ear-piece per tech. This can possibly lead to issues if one of the techs is more experienced or more attentive to detail than the other.
* If you do a rush order, the package MUST have "RUSH" prominently written on it on all sides otherwise the rush may be delayed. They receieve hundreds to thousands of packages per day, so if a rush order doesn't visually stand out it can easily not be seen as soon as it arrives.
* A rush order only entitles you to a rush for the initial manufacture. If you have to send it back for a refit or a remould, it will not be processed as a rush.
Having ear impression taken:
* The best placement for the bite-block can be found during 3:59 - 4:54 of the video on this page: http://www.engadget.com/2011/08/09/westone-lab-tour-how-in-ear-monitors-are-made-from-impressions/
* There are different materials for the material used when taking ear impressions (some of which are significantly more expensive for the Audiologist to purchase than others). Depending on the material, some are softer versus harsher, some cure faster versus slower, some produce better moulds, etc.
Fit issues:
* A poor fitting ear-piece can cause an ear infection. While my right ear-piece was perfect, the left ear-piece was very problematic and caused nausea, pain, and pressure issues, lasting for days after taking a break from them, necessitating a visit to a (non-ER) urgent care facility, a visit to an ENT specialist, and having to take a course of prescription ear drops.
Misc:
* Westone wants ALL communication to go through your Audiologist. If you try to call them they may talk to you, reluctantly, but will stress that you're supposed to be going through your Audiologist. This can be an issue if/when you really need to speak directly to them and not through a "middleman".
* According to Westone, Audiologists are NOT themselves supposed to make ANY adjustments whatsoever to the ear-pieces, even if they have the equipment to do so. All adjustments, no matter how minor, are supposed to be made directly by Westone.
* Also, According to Westone, a return of the ES5s -- while extraordinarily rare -- is, apparently, technically possible, but only after exausting all other options in terms of refits and remoulds.
Due to the fitting issues with the left ear-piece I haven't yet had a lot of time with them, but of the time I have spent with them so far I absolutely love and adore them and can't wait to be able to enjoy them full time.