I wanted to share my experience with DeMellier on this thread. I bought two bags from them as gifts. I've seen one, and the other was on pre-order and will be shipped directly to the recipient, so I won't be able to see it in person.
The first was a midi Venice. The quality was alright for the price. I'd say it was better than the quality of
Coach New York, but not quite as good as Coach 1941. The leather was nice enough for the price point, but the bag was grained and I prefer smooth leathers. I think Coach 1941 has a nicer feeling pebbled leather. I do hope to get a smooth leather bag from them one day, but I'm waiting for their next season releases. The stitching and construction were alright, and the hardware definitely in the mid-range, not particularly heavy but not cheap. Overall, I'd say it's contemporary quality at a contemporary price range, which is very fair.
The quality control was lacking in the bag I saw. Part of the strap was glued and the glue came undone (better construction would've been to sew it). The suede on the bag was also uneven (parts of it looked worn out). I contacted DeMellier and they were very kind and willing to take it back including shipping, even though the bag had been hotstamped and therefore non-refundable.
Overall, I'd just be aware that the price is reasonable because the bag isn't TOP quality, but still good and a great alternative for all the run-of-the-mill mid-range designers that you see. I would definitely recommend buying from them with confidence because their service is really top notch, and you'd be hard-pressed to find anything like that in this price range.