I've had mine in for 6 days now and I ADORE them. To answer the question, they definitely feel like my natural hair but a little dry.
I had my test locks in for about 5 weeks, and washed and conditioned 4 times before my installation. After I'd conditioned my test locks they felt fluffy and soft. I guess I have the most coarse textured hair 4c? So there was no slippage of the testers, so if it becomes unbearably dry I might condition for a few seconds after a wash.
Side note: the lady in the 3rd pic of the op is British (or lives here). Her hair looks beautiful in that pic, as do all the pics on her insta. However I saw her on a train once and those pics do no justice at all...her hair is stunning! Stunning. She got off at the same stop as me and I was walking behind her just mesmerised