DrKlang 3 Pack Acoustic Sound Deadening Panels - 47.2"x23.6"x0.36" Noise Reduction Wall Panels with Diagonal Slot Design for Home Studio, Office & Gaming Room - African Grey Pattern Sound Absorbing Wall Art for Better Acoustics

What I like:The DrKlang 12 Pack Acoustic Panels, 11.8" x 11.8" Decorative Soundproofing Panels were quite fun to install, as there is no set rule on panel placement. While it's important to make sure that the point of first reflections do have coverage, it's fine to get creative and design a placement layout to suit one's aesthetic taste. In fact, it's typically not necessary to cover every inch of large sections of wall/ceiling to obtain a measurable improvement in overall acoustics. Moreover, science and research supports a multi-faceted approach when it comes to improving acoustics. For example, I installed these panels in a room with terrible echo issues, as the room has 100+ yr old plastered walls and bare hardwood floors. In a room such as mine, applying acoustic panels, alone, will make a difference, but in addition to applying these panels, I also placed a large ottoman into a corner of the room, put down a thick exercise mat, installed blackout blinds to the windows, and placed other furnishings throughout the room. To summarize my point, acoustic panels are most likely not a cure-all to minimizing standing waves within a given area, but acoustic panels, combined with the addition of various furnishings, will collectively go a long way in breaking-up the standing waves within the environment, as the varied random shapes of the furnishings, along with the panels, work together to diminish the unwanted echoes and rogue vibrations.All of that beings said, I was dubious about the effectiveness of these stylish panels, as they lie so flat in comparison to the thick-foamy type panels that I am most familiar with. I am pleasantly surprised and happy to report that these panels have, in fact, made a marked difference in my ever-evolving mission to create the best acoustical environment possible, as I take my music very seriously.What I don't like:There is nothing about the product I don't like, but I feel that touting the panels as "Soundproofing" is a stretch, as true soundproofing just doesn't happen by applying panels to walls and ceilings. To attain actually soundproofing (as it's defined), one would have to get involved in actual construction and remodeling to meet that end, following the same degree of engineering that goes into building a professional recording studio. Despite my talking points, these quality panels contribute a great deal toward the end strategy of limiting audible standing waves, thus diminishing annoying echoes and reverberations within the acoustical environment.I would certainly order this item again.