A spreadsheet is a wonderful idea, but I would check the reviews as it may have just been a fluke. So if you are thinking about a certain vendor, you can look up their problems and how they were resolved before you order. For instance, one of the vendors listed above gets some bad reviews, their customer service is lacking, yet some people just love them. I do not. Another vendor didn't send my stuff out for 4 days. To me, that is unacceptable, EVER, without said vendor contacting me about a problem. That item took 10 DAYS to get to me, and it was my fault for not checking their bad reviews first. I just won't order from those 2 vendors again unless it is something I absolutely can't get anywhere else, which isn't going to happen considering all vendors are ordering from China. One vendor gets all crazy with it and renames stuff so you may THINK they are exclusive (which they like to claim) when it is just their name that is.
VapeDudes clearly stated when I ordered from them that there was a 72 hour turn around time, so when I chose to order I went in knowing that, and wouldn't order hardware like the above poster did from them until they could catch up on their orders. At least they do disclose that unlike some do.
Will you be publishing your spreadsheet so we can see your experiences?