The August/September issue of Tools4Music magazine, available printed and online, includes a full, detailed 3 pages long review of RF Explorer (in German). The author, test editor Stefan Kosmalla makes a clear statement on how difficult is for professionals to keep pace of the ever changing wireless spectrum due to congestion, interference and regulations: RF Explorer is the right tool to avoid last minute surprises in important events.
See summary from SeeedStudio blog here.