Comparing to Welborne Labs DRD 300B, 805 AE's have most of the 300B magic but much more versatile. 805 AE's have all the attributes of SET, both strength and weakness, despite bigger output wattage. DRD 300B does vocal (especially female) and solo string instruments somewhat better, 805 AE does orchestral music better, and 805 AE is a clear winner in solo piano with much better dynamic and lower-end extension.
I use both amps to drive ProAc R2.5. Although 8W output from DRD 300B doesn't seem to be enough for R2.5 at 86db, they recreate very realistic sound of orchestral pieces (like Mahler symphonies) in my small 11x18 living room. 805 AE will give you more flexibility to deal with many more speakers and bigger room. However, don't expect earth shaking bass from organ or percussion instruments. In fact, you don't get that in the concert hall either.
I use both amps to drive ProAc R2.5. Although 8W output from DRD 300B doesn't seem to be enough for R2.5 at 86db, they recreate very realistic sound of orchestral pieces (like Mahler symphonies) in my small 11x18 living room. 805 AE will give you more flexibility to deal with many more speakers and bigger room. However, don't expect earth shaking bass from organ or percussion instruments. In fact, you don't get that in the concert hall either.