My company rents the Bron 220
1 After meeting with Bron in Switzerland and discussing the Para use, here are some tips: don't use the Para closer than the umbrella diameter otherwise you loose the "Para effect"
2 We use the #2 diffuser for the best shadowless effect, while still maintaining the "Para effect"
3 The Para will accept any brand lamp base with a standard 5/8" mount.
4 The "Para effect" is seen best when the lamp is in the flood position: ie, at the front most position
5 Anecdotes from others in the industry I have heard re: Briese is that they are very easy to damage both umbrella and lamp. They are also incredibly expensive. We investigated them and they were double, triple the price of anything else.
6 You will probably loose color temperature control if you mix heads and backs between brands. The bron Grafit pack maintains color balance with its heads
7 Experienced users of the Para can open and close the unit within a minute. You must however check the hinge for fabric snags.
8 I highly recommend the geared head with use of the Para (with a wind up stand)
The Para effect is unique vs any other style of light modifyer such as octa-softboxes. With experimentation you should be able to learn to control the unit how you want. There are many lighting tricks you can use with the Para, but I will leave that up to you to find out.
The Para is a great accessory, and anyone shooting fashion through to room sets will love this light.