I use the Linhof Techno, and on that I use the excellent Linhof self-supporting flexible screen shade (which is flexible to change shape but holds the shape). I don't use the magnifier lid, just use look into the shade as a chimney and further shade with my hands, it becomes a bit like looking in a waist-level viewfinder of a Hasselblad V. In rare conditions I do use a black $10 t-shirt as focusing cloth
, I put the t-shirt neck around the shade (use a t-shirt with tight neck so it fits snuggly, it can hang there from the shade without support, so there's a reason it's a t-shirt) and put my head in it. Since I got the new bright ground glass I extremely rarely use the t-shirt, hand-shading plus screen shade is good enough for most occassions. In dim light (indoor, after sunset etc) with the SK35XL I use it from time to time.
(The t-shirt also doubles as body padding in the F-stop X-large ICU where I store my system. The Techno body is due to it's shape a bit messy to pack, I put the body on it's back in the bottom of the case with lens mounted, and then softly the t-shirt irregurarly on top to fill out the space so the camera don't shake around a lot.)
One advantage of having a flexible shade is that if you have shifted a lot or otherwise need to look from the side you can bend the shade to do so. The advantage of not using a magnifying lid or other viewfinder attachment is that with this flexible shade you can keep it on at all times, when focusing critical with the high magnification loupe you just fold it together in place.
Setting up and shooting with a technical camera involves many steps, and I've tried to cut down as many of them as possible to get a faster shooting procedure. For example I have a short cable release attached to each lens I have so I don't need to attach one for each lens change. Having viewer options which you don't need to attach/detach between composing and critical focusing is also a part of this concept. Some will think that the unmagnified ground glass is too tiny for composition and will want a magnifier lid attachment (it's only 4x so not usable for critical focusing, so when done composing you detach it and finalize with a high magnification loupe, such as Linhof Studio/Silvestri 12x). I have that, but never use it.
A disadvantage of my setup is that all Linhof-branded components are crazy expensive. Related to the system in whole it's not a big deal, but a couple of hundred euros for the flexible bellows and a few more for the magnifier lid does feel a bit expensive for these type of parts.
sliding back with the flexible self-supporting bellows shade:
me under the t-shirt
4x magnifier lid, which I never use (if someone wants it I can sell it), but some probably would prefer instead of unmagnified when composing. This could also be used instead of the t-shirt, you should not need a focusing cloth with this lid attachment. Oh well, there are some light leaks still around the lid due to poor design, I don't remember if they were critical or not though (ie if you still would need a focusing cloth on top of this in some conditions).