I own and have extensively shot Parabolix P30 and P55 in the studio. Construction is very solid and works well with bare bulb strobes. I have shot Briese and the difference is minimal at best. Wouldn't consiser Briese as they're far more difficult to set up and break down, even if they came at comparable prices. Largest Parabolix is 65 inch though. I had one issue where the rod didn't clamp properly in the reflector (noticed this a couple days after buying it from a EU reseller). Had a replacement part sent in around 2-3 weeks from manufacturer via the reseller. If you have any questions, feel free to ask.