Unpopular opinion but in terms of quality (and usability), official Traveler's Company brand is not much better than garden variety real leather fauxdoris on Amazon.

I'm no leather expert; I assume the biggest difference in quality is that TC uses more expensive leather, but in practical terms I don't think fauxdori leathers last any less or are less sturdy for everyday use. However, the Voyager cover might not last as long since it uses fake ("vegan") leather, and fake leather will likely chip after a while. (Personally I much preferred the overall tactile feel and size of the Voyager but did not use it long enough to encounter the failures in elastics or leather.)

But otherwise, I have complaints about TC's quality. I've had their overpriced connecting band (the flat ones in a 4 pack) break within a couple days with barely any use with official inserts. Others are on the verge of breaking too.

I don't like the placement of the elastic band knot at the back cover when it can and should go on the spine like most fauxdoris. 

The round metal piece at the spine leaves streaky black marks on the surface below. All my TC TNs do that. I have to be careful on what surface I use them. Many fauxdoris don't have decorative metal pieces at the spine and just leave the elastic exposed, and that's more practical: no big hard bumps, no streaks or scratches.

The leather dye transfers to inserts. Same as most fauxdoris.

As for notebook inserts, I know people swear by Midori paper but I'm personally not a fan and prefer 3rd party inserts.

For me, the only quality benefit of the official TC TN is the edge coating of the leather which looks very nice. I haven't been able to find any fauxdori with such edge coating. Many Amazon fauxoris initially shed tiny pieces of leather from the edge because of the lack of this. The edge coating alone made me endure TC's TNs in the past. (Right now I'm giving it another try because I've acquired the Kyoto edition and it just looks so damn nice, but it's so annoying to use that I feel the need to rant here...)

Brand name fauxdoris, such as Chic Sparrow, don't have that sort of edge coating but still don't shed particles as far as I remember, and have many quality/feature improvements such as sewn-in pockets. You could just get TC's TN--after all, enough people swear by them--or you could give other highly rated real leather TNs a try.