On the left is the Steve Kaeser Enterprises enclosed umbrella with a Speedotron MW3U light head firing at 200 watt-seconds. On the right is the considerably more-costly Lastolite Umbrella Box, also with a Speedotron MW3U flash head firing at 200 watt-seconds. I think the photo speaks for itself about the difference between a cheap Chinese knock-off, and the original Lastolite Umbrella Box.
"Often imitated, never equalled."