I tried a dozen each of Neolithic flints.
Their Black English, and Texas Chert.
I won't order from them again if there are still other options available.
On the plus side..They flatten the tops of their flints so you don't get any "Humps". They are (or at least were when I ordered..) less expensive than other options. That's not really much of a concern when you figure how little difference cost of a flint makes in the overall cost to enjoy our sport, but it's worth mentioning to be fair. Sometimes I just enjoy "trying new things".
On the down side...Their sizing criteria wasn't suitable to my needs. I got several that were undersized in terms of length, and several that while ground off to be flattops...were VERY thick.
I'm not trying to pick on them, just writing up my personal experience. Your's may differ.
FWIW: I don't order flints from TOTW either. Did that once, don't plan to do that again.
After I tried my first order from them, reading here and elsewhere on the 'net,I came to understand that some folks who order flints from TOTW make a special request for "No Humps", and really like the ones they receive.
I don't know if that's a universal option, or only available to some customers. That's ignorance on my part. I was not aware that such a special request was even possible. As a result, in the bag I received I appear to have gotten the "Humpy" ones left over when they selected flat flints for others.
Again, I'm not trying to knock TOTW. I continue to do business with them as my needs arise, including a gun trade, just not flints.
Lest someone think "there's just no satisfying this guy"...I was fortunate to get a couple dozen of Rich Pierce's White Burlington Chert flints before he stopped offering them. They worked well in both my T/C and Chambers locks. These days, I stick with French Amber and am quite happy with the results.
BTW: I've been told by European friends that the sawed Agate flints they use over there are "very different" from the ones they see commercially offered here in the U.S. They report being very satisfied with the European Agate products, although they also report they are significantly more expensive. I've been quoted something like US$8.00 each ( OUCH..!!). I've wondered if that difference they refer to might explain why some folks really like Agate, and others don't.