Update re: "Just adding a datapoint for shipping schedules"...
My SDS3034X HD arrived today (ordered April 3 via Siglent NA rep). While discussing my quote, the sales rep said I should submit my order ASAP so I could be in the next batch of SDS3000X HD, because the demand has been quite high. He said he was "supposed to say 6 weeks lead time", which I interpreted to mean there was a chance it might arrive early, which it did. But then the order entry specialist said it would arrive "on/before May 31", which seemed similar to what I've been reading here.
Anyway, hopefully this means others will get theirs soon. I don't know how much difference it makes ordering from a distributor -vs- directly from Siglent.