I have been using Tirerack for 15 years, and they have been excellent to me. Rather than spend hours trying to negotiate a price, and being subjected to bait and switch at the tire shop, you know exactly what you are getting. Most tire places will try to substitute another brand or model tire in place of your getting a Tirerack purchase, so they can make more money. But if you just move forward with Tirerack it saves a lot of time. The service writers are essentially well informed salesmen, and they have methods to try to sway you away from Tirerack to something that has higher markup: when they see your a Tirerack customer, they automatically know you are a well-informed consumer and probably an auto enthusiast, so they tend to back away from high pressure sales tactics.
Tirerack customer support is excellent: many years ago I had problems with Goodyear Wrangler RT/S LT tires on a Suburban. I kept getting a hard ride and what felt like out of balance, but I watched them balance it perfectly. I called Tirerack and spoke to customer support- they escalated it to a really good support rep, and he volunteered to pay for road force balancing of all 4 tires. My shop found that 3 of the tires were bad- way outside of the limits- its been a while but I think they said many of the tires generated 80-120 lbs force when the limit should have been under 20 lbs (correct me if I am wrong). So Tirerack replaced 3 of the tires, sent them out ASAP. My shop mounted those tires, and all 3 of those tires were also bad on the road force testing. They sent out 3 more tires, and a few of those were bad. At this point my Tirerack rep called Goodyear and forced the local rep to go out to my shop, and called Hunter and requested they send out a tech to verify the calibration of the Hunter GPS 9700 road force balance machine. The balance machine was found to be perfect, and the Goodyear rep validated the tires were in fact way out of spec. After about 7 days of this in and out of the shop, I finally got 4 good tires.
Now- this sounds like Tirerack was shipping me bad tires, but their reps went out of their way to help me, and they paid the shop for all of the labor. A few weeks later, the Tirerack rep called me back and informed me that Goodyear found a serious flaw in their factory that made this specific tire and size, and a sample of the tires found a high out of spec issue, along with a few other complaints from shops about "hard to balance, high vibration" issues. The problem was reported to me that "some machine that builds the carcass of the tire was improperly calibrated" and a large number of tires were bad: it was not a safety issue but ride quality issue due to irregularity of the tire carcass. I got the impression that it could have been as high as 1000 tires. They did a quiet recall of a large run of tires across North America, and refunded my original purchase price, and gave me a significant credit towards future Goodyear tires. The Goodyear rep called me and thanked me for my persistence as well.
I had a prior issue a long time ago with a major tire retailer , and the [censored] I had to fight with them over what was a very simple problem was extreme. Comparing that to the great service I got from Tirerack was wonderful. They helped me every step of the way, paid for everything and then some, and as a result also prevented up to a thousand other customers from suffering the same problem. The shop I deal with is a high end repair shop that does not stock tires but does have a road force balancing machine, so I consider them to be neutral observers.
TL;DR - had huge problems with tires, and Tirerack supported me and got the right people to investigate, and was instrumental in helping the manufacturer prevent a serious PR issue.