Was coming back to add / edit something. Was surprised too by those specs so i did some search. That DIN45500 mentioned near W&F i think is different standard than the WRMS manuals mention. I checked some PDF manuals i have , they mention two measurements, WRMS (Weighted RMS) and Weighted peak. I think the DIN is the weighted peak standard. More or less is close as double the WRMS value. The numbers i mentioned are for WRMS. To have a reference how these standards seem to relate :
From a couple of manuals : Sony TC-K700ES - 0.04% W.Peak , 0.025% WRMS. Nak BX-300 - 0.048% WTD Peak, 0.027% WTD RMS (That's WRMS) .
So if the specs of Marantz's W&F is at weighted peak -most possible- still are -quite- bad but not terrible / broken bad. Still i wouldn't buy it though, but that's just me.
Search Tapeheads for reviews, i think they are better trusted than someone who bought a deck just to digitize his childhood tape, did his job and he is happy about just that. One here :
http://www.tapeheads.net/showthread.php?t=51697Edit : I was and am probably confused and confusing with what is standard, what is measurement, etc. I am everything but an expert. But bottom line is and stays the same. If that number in specs represents Weighted Peak then hm OK, if it's WRMS avoid at all costs even if it's not true.