I have purchased two Seaton Submersive subwoofers in the last 12 months. Mark's support to me has been excellent. His products are one of the brands that I recommend to my clients because the performance of these products warrants their cost. I do not recommend products when I have have client feedback that indicates deceptive practices or poor consumer support. Not considering a SubMersive HP+ if you want exceptionally accurate bass is denying yourself a product that surpasses others on the market. I find Seaton SubMersive to meet my preferences better than anything else I have encountered.
My experience is from calibrating thousands of home theaters with subwoofers from Aerial Acoustics, Angstrom Loudspeakers, Atlantic Technology, Axiom, B&W, Bose, Boston Acoustics, Cabasse, Crestron, Crystal Audio, Danley, Dayton, Deep Sea Sound, Definitive Technology, Elemental Designs, Energy, EPIK, Episode, era, Focal, Funk Audio, Gallo Acoustics, Genelec, Hsu, Inifinity, James, Jamo, JBL, JL Audio, JTR, Klipsch, Krell, Legacy Audio, M&K, Martin Logan, McIntosh, Mirage, MJ Acoustics, Monitor Audio, MTX, Neumann, Onix, Onkyo, Paradigm, Parts Express, PSB, Polk, Power Sound Audio, REL, Revel, Rythmik, Salk, Seaton Sound, Snell, Sony, Sunfire, SVS, Talon Audio Technologies, Tekton, Triad, Velodyne, Von Schweikert and Yamaha along with some others I cannot remember,. My experience also includes large 18" infinite baffle installations and many other DIY subwoofers.