For me their offerings are getting way too confusing. I have bought a couple times from them, and shipping is just crazy long. One was a SHD knot, which has very little if any alteration of the tips, and I must say I really like it - but price-wise with shipping it is close to the cost I pay for other knots. Then I got a set of Lotus hand-tied. These are extremely processed, and the results is a very soft, nearly slimy feeling, knot, some call it powder puff, marshmallow or whatever. I have made one for myself and one for one of my best customer. He returned his and had the knot replaced after only a few uses with a Shavemac two-band silvertip. I use mine form time to time.
My problem with Chinese suppliers is that I really never know what I am getting. Some years ago, before the name Oumo came around, I bought some sample knots from China and they were great. My next order, from the same supplier and the same type of knot was also a very good quality. I even made a brush for a forum with these knots. Then when running low, I made another order, and it was horrible. These knots are extremely scratchy/prickly and I have sold only one brush with them. Now, I am sitting on a batch of, for me, not usable knots.
I also tried some of the processing that was described on the diverse fora, like using some hair products and also using a hairdryer on them. The scritch does not go away!
This was the end for me to buy from Chinese sources, although I must admit my two orders from Oumo was after this bad experience, as this company was new to me and got pretty good feedback.
I am now using only badger knots from Shavemac, mainly their two-band silvertip and the D01 version, and synthetics from Muehle only. Both companies are in Germany and their knots are made by hand. I can speak with them without any issue since we have the same native language. If there is an issue, it will be remedied asap. Probably I am selling less brushes, but I know I sell a highest quality knot in them. The two-band silvertips from Shavemac are over the time I use them very consistent, and I have used a lot of them since the day they were first offered. In my personal stash I have brushes with these knots made over a time span of 10+ years, and they are all the same quality. There is no up-down variance like I saw in the Chinese knots.