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I have a couple large soft boxes from Westcott. Heavy canvas build and metal rods. Designer for hot lights. In fact so heavy I can't pull them apart most of the time. If apart they are easy to put together. Screwing in the bulbs takes longer.
I also have set of 4 really cheap Britek units. I leave together as they fit in my back seat. Pull out and place on stand, already put together. Like I said they are cheap Vinyl and the soft box is nothing to brag about. Using for 3 years and still work so guess they are OK. Holds (4)55-85 watt bulbs.
For higher cost high watt and good quality look at Photoflex site. I have seen in person and they were nice. As good as my Westcott but holds super high watt bulbs around 150 watts each. Maybe 200 watts each.