Lots of people are waiting on 5600's. The deal is that they have been quite a bit more popular than they planned for, now they are making them as fast as they can - but sales are outpacing production for a little while. Not a terrible problem to have, but I'd say it'll be worth the wait. We've installed quite a number of them and customers are happy - though we'd all like to get them quicker! I'm not speaking for them, but as someone who's sold many of those boxes I know anytime stuff sells faster than it was made we get this sort of backlog for awhile until it all gets caught up.
Just my 2 cents as usual.
Cheers,
Stein