The Cleasonic Sorbers are very well made and finished. While it is possible to make absorbers with a similar effect using your own materials, the result is rarely as well finished and convenient in use as these are. They are easy to assemble and mount in various configurations (I have some in a tracking area and others in the monitoring area). Mounting and positioning is carried out neatly and quickly using Velco tapes. They make a very positive contribution to controlling room-based reflections and the difference 'before and after' is obvious. They really 'tighten' up the acoustics. They are also easy to transport for mobile sessions. While not 'cheap' they are very good value, and can make more of an improvement to your recordings than upgrading preamps, microphones or monitors. Totally recommended.