I've had the Aperions for close to a month. Members on the forum said I would be wise to also demo the SongTowers, so I ordered those as well and received them yesterday. The Aperions allow for Bi-Amp, which I had been doing. I went back to running them off one set of wires so I could have the Salks on "A" and the Aperions on "B", for quick back and forth comparisons (Technics SA-DA10 AV Receiver - 100W/channel). Both speakers are highly reviewed under the professional product reviews on this website, and have very good linear responses across the frequency range. The Salks have not yet had break-in time, but the paper work from Salk said to pop in their demo CD and start listening critically right away. I will have them on all day today, and will compare again tonight. The Salks have no grill, as that is recommended for critical listening by Salk. The Aperions have the grill, as the manufacturer says they are voiced with the grill on. At first, I had the Salks on as I watched my recording of "American Ninja Warrior" from the night before. With mainly commentator voices to listen too, I noticed something that I later noticed as we went back and forth on the speakers with the demo music CD. The Salks are very pure, but sound thinner (less bass?) and don't fill the room with the same width. The Aperions sound a little dirtier (you get the feeling that you can hear a little more static from the recording), but seem to have more bass, sound more rounded, and fill the room better (advantage of having two 5 inch and two 6 inch drivers?). I tried to get my son to not tell me which speakers he was turning on as he went back and forth, but after a few minutes, we could all identify which speakers were on easily. They both sound good, but different. My wife absolutely likes the Aperions better. My son and I are torn, as we appreciate what seems like a cleaner, less distorted purity of the Salks, but miss the fullness the Aperions seem to bring to the table, and which might be better for my home theater application. I have a large, 18inch Tekton Designs Cinema subwoofer on for both, with crossover at 60Hz. Both speakers look amazing. The Salks look boxier, but have a very nice finish. The wife again prefers the look of the Aperions.
I will post more as I give them all a little more time.