I use reflex hoods on Sinar and Arca. Both are very helpfull when used with wide angle lenses and center filters (i use 72mm xl and CF a lot).
Sinar has knob and Internal mechanism to adjust mirror angle, Arca has gear and knob to do the same. Changing mirror angle lets me see image on whole GG compensating falloff. When working with people (not so much time) I do rough focusing and tilts with hood on and then remove hood and do final focusing using loupe.
Sinar unit is big and bulky, Arca unit is pretty compact. Also, Arca mirror fixed to hood while Sinar mirror moves - that makes mirror more prone to breakage, I broke few.
I used rigid Linhof mono viewer with TK, no comparisin with above 2, one of main reasons why I gave up on TK. Also using bellows and binocular viewer is not as convinient as 2 above - you have to keep proper bellows extension to have GG in focus, which occupies at least one hand.
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