We do have lab testing and reputable distributors with integrity do list the REAL specifications on their products. Unfortunately, some distributors instead simply fill in the specification fields with marketing BS that is meant to sell the most product.
It is quite simple to perform controlled testing with less than a $3K investment. Unfortunately, the results of these tests are typically discounted because they are not produced by an independent and neutral third party. So we are left to judge the performance on questionable testing scenarios. It would be great to have product comparisons provided by a qualified and independent process. Only then will we really know who prints BS specifications and why some products with real specs simply outperform others with great looking specs.
The running joke with the LNBF factories has been...
Importer: "What is the NR on this LNBF?"
Factory: "What do you want us to print on the label?"
Unfortunately, this is the truth!