I own EIN-001, EIN-002 and EIN-003. They are very short, between 10-25 minutes and I would say that they are "okay" but nothing too spectacular. Have only watched them once. That is probably the reason why I stopped buying them because they didn't "wow" me and I also don't own VR equipment so I have to watch them in 2D. I will probably still get all of the other videos (EIN-004 - EIN-009) because I like to collect everything that contains my favorite fetishes but I will wait for them to get cheaper or if a sale comes around.
I also own RCTVR-004 (javlibrary.com/en/?v=javli4zws4) but as you said it is not really worth it. It is funny but nothing special.
The newest release DNJR-063(
https://www.javlibrary.com/en/?v=javme3bg5i) is a okay fart fetish video if you are into "fart domination".
Yes, it is really nice to talk with other like minded people about this fetish.
@octobre_2 In your screenshots above you showed a little bit of your collection. Can I ask what videos (categories) you collect?
As for me I mostly collect scat, pee, enema, fart and bdsm videos and everything that is similar to those categories. If I like a specific "fetish" idol I also get videos outside of those categories if they are in them.