Ok, to answer most questions :

1) Yes, they are serious and they won't take
   your money away.

2) No, mail order is not their main business
   and so it may take time to get an answer from
   them.

3) Their website is definitively not up-to-date
   and they never claimed that it is. So until
   you get a confirmation that they still have
   the cels...

4) Most people here don't seems to have problem
   dealing with japanese, which usualy mean
   paying them in their currency (yen), using the
   method they want (wire transfer)...
   I can't understand why the same conditions
   seems to be a problem when the dealer is not
   japanese....

   Or more simply : They will sell to USA but
   that's not their main goal. So you will have
   to pay them in french francs, using the methods
   they want/can accept. If that's not ok with
   you, then don't order.
 
It's not poor customer service : it's simply
how things are. Like AWS, Mandarake and others,
if you want to buy something by mail order from
them, get their mail-order catalog (in French),
send them back the order form and accept their
mail order conditions.

Cheers,
Yann Stettler