I have a set of Dunbar P-3's, played them for about 7 years now. I've always been satisfied with the tone. I frequently replace the Dunbar chanter with an old (40's - 50's vintage) Forbes blackwood chanter. When I use the older chanter I sleeve the drones to make it easier to tune to the flatter pitch without fooling with the reeds.
Just under a year ago I bought a set of plain turned, chalice topped Kintails. I enjoy both sets, but there are differences (at least to my eye/ear).
In their stock set up, I find the Dunbars to be louder than the Kintails. Actually, even with the drones sleeved and the bw chanter they still seem to be slightly louder. The Dunbars are slightly heavier on the shoulder, and are more problematic with moisture. I play synthetic tenor reeds and cane bass in both sets, with a McCann chanter reed in the Forbes and Dunbar chanters and an Apps reed in the Kintail. My instructor is a strict traditionalist who only plays cane reeds, and he approves of the tone of both sets.
I initially bought the Dunbars with an eye toward durability. We do a good bit of Rendezvousing and Reenacting, and we have 11 grandkids. They seem to fill that requirement well. 7 years so far, without any major damage.