I have a Classe 15 in my secondary system. I also heard the Classe 25 many times over the last 15 years. The Classe house sound is a little dark sounding. If you don't like bright, this is an amp to consider. I am running my Classe 15 amp with a tube preamp and Vandersteen 2CE speakers. It is mostly used for background music while I am on my computer, but it is a very musical sound.
Keep in mind the Classe 25 amp is at least 16-17 years old and if it were I, I would probably think about replacing the caps if they are leaking. The Classe is 250w a channel at 8 ohms, 500w at 4 ohms and 1000 watts per channel at 2 ohms. It is perfectly stable down to 2 ohms. My Classe 15 amp has been 100% trouble free. The power supply in the 25 is very overbuilt as is the heat sinking.
I know nothing about the Rowland amp.
Keep in mind the Classe 25 amp is at least 16-17 years old and if it were I, I would probably think about replacing the caps if they are leaking. The Classe is 250w a channel at 8 ohms, 500w at 4 ohms and 1000 watts per channel at 2 ohms. It is perfectly stable down to 2 ohms. My Classe 15 amp has been 100% trouble free. The power supply in the 25 is very overbuilt as is the heat sinking.
I know nothing about the Rowland amp.