Zander 940/941 or ZS-1 Flight Computers???

Hello All:

I've got a couple of questions regarding Zander flight computers. If
anyone has any insight (good or bad) I would appreciate it.

1) Are there any opinions out there about the Zander 940/941 flight
computer?

2) How about the new ZS1 flight computer?

3) For North American pilots, any idea why they are so popular with
contest pilots in Europe, but seemingly so unpopular on this side of
the pond?

Thanks in advance,
Tim McAllister EY