I can't wait to get this baby.
R/Rs is my number one atty till this day. I have three of them. Tried X but it's not as good as R/Rs even though it has LFC which R/Rs doesn't have. Only better feature (for some people) which X has is top filling but for me it's not important at all.
I'm really happy that it's more R improvement and less X. Even new decks are almost exact R decks and nothing like X ones.
Also, if the dimensions are correct and precisely defined and there's no reason to believe they are not, these atties should be the same as R/Rs which is great as I don't consider Rs to be big atty. R is big for my taste by Rs is not.
This is what is written for E:
Height (without SQuip Tip and 510 connector): 59mm (4.5ml) / 52mm (2.0ml)
And this is Rs:
Height (without Squip Tip) : 49mm
I have measured my Rs with 510 connector and short SQ drip tip and it's 67-68mm.
According to this 4.5ml version should be almost the same as Rs with short drip tip and when screwed on a mod which is absolutely great.
And first review but it's in German.