I used to have an Acratech Ultimate ballhead. I liked it very much. Did buy an RRS BH 40 later, because I wanted to have a lever type QR. I used to mix up the screws on Acratech and several times loosened the lens by mistake. Other than that the Acratech was good, and now they have a lever QR of their own. Right now I use an Arca Swiss D4 geared head, but that is quite heavy.
I need to have a travel-light bullhead like SSR BH-25 LR as a substitute to my BH-55 when traveling. My cameras are D800 and PhaseOne DF+. Do you think BH-25 LR is a good choice? tripod is Gitzo carbon.