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The diameter of the 86" (as you know since you have the translucent) is actually 6' from top to bottom, and not very deep, so I'm still able to use it in some pretty tight locations. Makes a great fake window light.
I also have the 60" photek softlighter for when I want to have the light coming from a higher angle (can't raise the 86" very high in rooms with an 8' ceiling, although you can table-top it if the subject is seated). I'm going to replace the Photek with the Buff 64" because the buff is easier to use (the Photek has a small elastic sock for a front opening on the diffuser, whereas the Buff has a larger opening with a drawstring closure), and I may even get the Buff 53" for headshots in very tight locations. Most of the time though, I'm able to use the 86".
Since softness is determined solely by the size of the light source in relation to the subject, the 86" will actually be softer than a 4x6 softbox. Just a different shape catchlight, and slightly more control with the box although I've found the soft silver doesn't have much spill to the sides, so I still get pretty good control.