I'm using the blue o-rings right now and they're pretty good. Also have a few sets with red (rubber?) o-rings and they're fine. Been told to avoid the X versions, so I have.

As for the rcmart shipping mess, I'm guessing it's just a matter of their shipping method, mixed with customs at my end. They're not shady. I'm thinking growing pains. They've gone from a tiny company that sold fishing supplies (yes, that's weird) to a world leader in rc parts in the space of 20 years.