I've been offered a part refund to cover the cost of a repair to the fine focusing so the camera is mine. Hurrah!
The TLR Mamiya is more practical out of a studio.
The single coated lens you have already you may want to go back to.
I initially began hunting for an SLR precisely because I was not happy with my rolleiflex. It's lens is completely uncoated. I like it, very much, but it's better with negative than it is slide, which seems to come out very flat looking. I won't stop using the rolleiflex but it's not going to be my main squeeze for landscape, where a wider lens and more precise focusing and framing will be needed, as well as ND filters, grads, colour corrections and polarisers (which are not available for the rolleiflex).
I was warned my tripod would be awful for outdoor use (it's a manfrotto 055xpro3 aluminium with a midi ball head rated to 8kg) and I've found this to be total nonsense (apparently, 3 section is too big and aluminium too heavy). I put a strap on it, sling it over my shoulder and walk as normal. And I'm 5 foot 5 of not at all macho!
Speaking of which, my manfrotto 498rc head is capable of supporting the mamiya! This surprised me, it's within weight limit but after tightening up the tension knob, it is very capable of supporting the mamiya and will not need to support it at funny angles thanks to the revolving back.
I took the outfit out for a spin yesterday to run a test roll of film, and a 10km walk loaded with camera, lens, cokin filter holder, kood filters, cokin square hood (all in backpack) and tripod (slung over shoulder) as well as half a litre of water and it made composition much easier than with the tlr (which is not corrected for parallax when focusing closer than several metres - slight, but there). I also felt much more at home with the wider, closer focusing lens (though I've been warned of soft results when focusing in the macro range) and the mirror lockup feature means I still get low vibration leaf shutter exposures.
In short, so far, I really really like it - and I think it's more than suitable for outdoors work as well as studio portraiture and the like. Youi do totally get why people would rather take a lighter set up for really long hikes and hill climbing, but I have my rolleiflex and ektar for those instances. For everything else, I have this dream camera, once the dream of many pros.
I will need another back for portra... And a third for pan f 50!