In general I have had very good interactions with TCC. I have used the library, mixing their thoughts with my own on choices.
The only negative occurred recently, asking about my 11.5% frequent flyer discount, I got an N/A response (this was on a $2K+ Cardas purchase), so I emailed a prior contact and he sorted it out.
On some product lines (e.g. Cardas) the cables are drop shipped from the manufacturer so there can be a 2 week lead time.
In addition to interconnects I have also purchased (Kimber) wire for the internals of my home brew projects.