David, the Givi screen is not very popular. But I managed to find a few reviews on the biggest German GSer forum. Most of them are positive. It seems people taller than 6 feet like it. They comment it being a good screen for a relative moderate price.
This with the cracks around the mounting holes on the BMW screen is an old story. It appears BMW currently is undertaking some effort to cut on the warranty screen exchange festival which happens every spring. A number of screens were found not faulty but damaged by unsuitable cleaners. I myself had never seen a cracked screen, but would like to.