Good episode and I believe this is the first time that we have an idea of the distances in the Dark Matter universe. You need "months" to travel the whole galaxy and a jump of 160 LYs is considerate a big one.
Well, if they literally mean the whole Milky Way galaxy rather than just some settled portion of it, then its stellar disk is estimated to be at least 100,000 light-years wide, maybe as much as 180,000. So if we treat crossing the whole galaxy as analogous to circumnavigating the Earth, then the hop they took would correspond to traveling 40-60 miles. Sizeable enough to be an effective test of the blink drive, but actually relatively small on a galactic scale.
Although I have a hard time believing they meant "cross the whole galaxy" literally. What we've seen of human space seems to be fairly concentrated around known stars, and it doesn't seem to be all that huge a territory or all that far in the future (since they still watch
Star Wars movies and read
Charlotte's Web). The galaxy has hundreds of billions of stars, and we're now finding that most stars have planetary systems. Assuming that colonization spread to the nearest suitable planets, then it would take an immensely long time, maybe tens or hundreds of millennia, for humanity to spread across the entire galaxy, even with FTL. Sure, they could have just a few dozen or hundred settled systems that are really diffusely spread across the galaxy, but where's the logic in that, particularly given the finite FTL speed they've now established? So what they've set up about the universe so far is incompatible with the idea of a truly galaxy-spanning human diaspora.
Anyway, it seems insanely reckless to get hold of this prototype drive and immediately plug it into their engines and take it for a test spin. Not to mention, why was the security on it so terrible? They traipse right into this room, wonder why there's no security, and Five says "This whole place is a vault." But they then immediately belie her words by just walking out with the thing and getting no security response but an alarm. What about all those high-tech-looking columns surrounding the case? Why couldn't they generate a force field or something? Why couldn't the door automatically lock and the air get sucked out of the room? This was a ludicrously easy heist for something that was supposed to be so carefully protected.
It was cool to see the variant use of the Transfer Transit process. I like how they've established a clear set of rules for how TT works and stuck with it and used it in the story -- it was clever that, even though the characters were in clone bodies, they still had to avoid getting killed so that they wouldn't forget what they'd learned. And it was kind of weird to see them pick up Five's clone and bring her back to the ship. I'm a bit disappointed we didn't have a shot of Five interacting with her clone. After all, it's not like the originals are directly teleoperating their clone bodies; the clones are running autonomous copies of their minds, which is why their memories are lost if they "die" before being reprocessed. And Nyx (?) did say that the travelers didn't have to stay in the pods the whole time. So we could've had an interaction between Five and Clone-Five.
Annnd... it looks like Devon didn't work out as a character in the long run after all. Although I suppose he could still survive, theoretically. Anyway, while I'm no fan of drug abuse, I felt the way the episode dealt with the drug issue was simplistic and kind of preachy.