Without a comp, just going by published specs I would say stock the 706 falls short of the units you mentioned. However one upgraded by Doug Oade should be significantly better. I just can't get past the no-file save on dead battery shutdown flaw so I'm holding off. The 661 mk1 & mk2 actually shutdown with a proper file save when internal batteries are depleted and if it's abrupt loss like pulling external power plug without batteries will still leave a file up to that point and it can be recovered. I have been in plenty of situations, as many here have, where batteries are low towards the end of a show, and I just kept my fingers crossed, ready to pop in backup batteries, and rode it out and made it to the end. No issues except de-stressing after the show. With this deck you can't let it roll and hope it makes it. You'd have to stop the recording early, replace batteries, and start back up again because the risk isn't just a cut, but ending up empty handed. Not good at all. Until Marantz fixes this weakness, I'm not touching this deck. Worse than no hold button, another deal breaker for me at least. Hope this story gets better....