I received my Weber ARC today, so thought I'd add my findings. I haven't got the DLC as they aren't available, yet!!
The razor looks and feels fantastic, it is quite heavy, actually a bit heavier than I expected.
Strangely for me there was 2 days growth to deal with today, which would normally mean me cranking the Merkur Futur up to 4 to clear the worst off in the first pass, but I thought I'd have a go with the Weber ARC anyway.
I loaded the razor up with a Gillette Super Thin, my blade of choice, and set to work.
The first pass was smooth WTG, but not as close as I would have got with the Merkur, the second pass XTG was just as effortless and removed just about everything that was left. The final ATG pass gave me an excellent BBS finish, which is something I can usually only achieve with an adjustable.
I'm very impressed after the first shave, so I'll be leaving it in the bathroom for now for regular use until I fancy a shave.
I would say it is a fairly aggressive razor, probably equivalent to about number 6 on a Fatboy or Slim Adjustable, but very gentle also. It certainly did a great job of removing my beard efficiently, but didn't leave my face feeling like I'd had a fight with a cheese grater.