Actually I am done with Arca. I tried to contact them numerous times, twice i reached somenone to be told of imminent delivery, but nothing happened. They ignore Emails. There is still no website. I refuse to do business with a company that behaves like that.
I always felt a bit bad about buying a photoclam multiflex, but dealing with them was so easy, when I had to return my head to them because I had smashed it onto something, they repaired it in a few hours, updated the knobs to the most recent ones and sent it back in no time, we are talking Korea here, not France. The only charged me for postage, although it was out of warranty by a long time. they even have a website. I wholheartedly can recommend Photoclam.
In the last 10 years I really tried hard to buy Arca stuff, cameras, heads, whatever they offer, as I think it is usually a great design, but every time it just wasn't possible due to their failure to get back to me. My business alone would have paid for their website.