A $199 Bode Frequency Shifter!?!?

Two for me please :-)
After shortly reviewing a Cwejman FSH-1 and a Sythesis Technology E560 I opted for the latter. Currently enjoying a Klangbau Köln variety after the E560 quit service. Analog ones are hairy to both design and maintain as it seems. Oskar Sala said his Frequenschieber had to recalibrated (frequently?). Digital ones avoid that problem but sound different.