All-
I went to a local shop and auditioned the D25s. The system as all Sim Audio Moon SACD/processor/amp and Siltech cabling. I didn't take note of the models but the amp was 5 channel at 150 wpc. For those in my area, I think you know where I was.
The D25 has the signature ProAc voicing. Easy to listen to, laid back, good soundstage and imaging. I think Richard is correct in that the bass is more pronounce. However, and this may have been the result of insuffcient break-in, they seemed vailed from what my memory provides from my time with the R2.5s. Still, very non-fatiguing and satisfying. It's hard to know if the D25 is better than the R2.5. But, considering it's going to be sometime before we see the D25s pre-owned, the R2.5 is a clear bargain at their current pre-owned selling price.
As an added adventure, I listened to the new Audio Physic Tempos aka Tempo 4. These are again, very much in the AP house sound. Analytical, very resolving and forward for my taste. BUT, the new side-firing woofer is amazing. Bass like nothing I have heared short of the Revel. The soundstage was actually larger than the D25s. There was more definition within the players as well. These are going to give the new Virgos a serious run for the buyers. It's going to be hard to justify the price jump. Also, the new cabinet is much more attactive than the Tempo IIIi's. The demos were in the Rosenut, which is a $350 (?) premium but I think the WAF is an uplift too.
I think a good tube amp would tame that forward sound. I know it did on the Tempo IIIi's I had.