Well, none of the email links from their web site actually function (mis-configured or out of date), but the email for the original eBay seller (Michael Wittig) works.

He's put me in touch with Thomas Wittig, who appears to be the software techie at least. Like I said at the outset, I think it's just a three man company. smile

Originally Posted By: Thomas M. Wittig
Dear Mark,

we have removed these functions for the moment, because they
did not work fine as promissed. We will implement them again
on a later firmware update. Sorry for any inconvenience we caused.
If you need any further support, please contact me directly again
at any time, greetings, T


So that's a good sign: they do respond (and quickly) to email.
And they do update their firmware -- most recently just a few weeks ago.

Apart from the missing FFT extensions (useful) and Roll mode (not useful), the rest appears to be as advertised.

And as long as Math and Quick Meas. are both turned off, the scope actually is fairly responsive after all. The manual does warn that turning them on will slow it down.. they just don't say how much.

More as I explore more..

Cheers