While I do not have any experience with Hovland, I do have a lot with Solen. And, the aforementioned description of each is accurate. Solen is a film and foil cap, which uses a 5 mil polypropylene film, coated with metal(aluminum, I believe). SCR is built by the same company(at the same factory) in France, using a 7 mil polypropylene film. SCR caps sound better and are more rugged. Price is along the lines of Solen. Hovland are film and foil(rather than a thin film metallorganic sputtered to leave a metal film). Film and foil caps are audibly superior. They are also MUCH more expensive, MUCH larger, and only available in MUCH lower values. I prefer to use film and foil when I can(and my project is cost no object). However, when you need a cap larger than 10 or 15 microfarads, it will be difficult to use film and foil capacitors. You would need metallized film, or even electrolytics(hopefully not). You can always bypass the cheaper caps with a small value film and foil, with very good result. Sound closer to the film and foil, price closer to the cheaper cap. As I previously stated, I didn't get a chance to dabble in Hovlands(I hear good things about them from some people), but have had good success with MIT and Rel caps. I have also read intriguing things about a cheaper(and better sounding) cap from Wonder that is aimed at MIT/Rel/Hovland, perhaps someone can comment on these... Just as there are better capacitors than Solen, there are also better inductors(North Creek, Alpha Core Goertz). I do wholeheartedly agree on the Ohmite resistors, and recommend them ALWAYS.