I also found that a pain, not being able to go back to an exact setting you found worked well on a previous job,The one thing that put me off the R-tech is it only displays the amps on the digital panel, so the rest is a bit guess workish, 100 hz on my machine didn't sound like 100 on the other machines i've borrowed, so was keen to have it display it specially for that price ect. I believe the Kemppi does.
The job memory thing is a good feature to go back to for once you find a sweet spot on a particular job,as my last post Job memory saves settings !
Interesting I found on r-tech website this page http://www.r-techwelding.co.uk/EWM-MIG-TIG-ARC-WELDERS.php however I can't find a link within the site it was only when i was directed via a search engine, wonder if they used to sell them or about to start selling them?