I still have the Special 25 which I bought in 2005. Last year June, I added the Heritage Special. The Heritage is more detailed and dynamic compared to the 25s. Comparing the sound quality, the 25 is great for background music while the Heritage is for serious listening. Bass is more from the 25 while mids and highs are preferred from the Heritage.
Both models prefer more power if using Class A/B amplification. For Class A watts, however, even 25 wpc, drive both models loud enough for me.