For me, the weakest point of the EBT is the CR-2 battery: it lasts only a hundred photos. After that, it starts to give random faulty flashes and some sincronization problems.
As CR-2 batteries are expensive (6€ per unit) I have "tunned" my EBTs using 3 Ni-MH AA elements (3,6 Volt). The experience has been completely satisfactory.
You can see my modification in the next picture: I have removed the screw that locks the trigger "shoe mount" as I use only the Sync Cord connection (I have found, also, that the hotshoe is not very reliable)
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