I run an old Oehler 33, an older PACT, and a brand new Oehler 35P concurrently. All sky screens are mounted to a single skyscreen rail. This way they all set up at the range equally quickly - or tediously - whichever way you prefer to consider it.
They all seem to work well in sufficient lighting conditions. The PACT is the first of the three to fail to give readings in fading light conditions. So I give the Oehler's the edge in reliability in poorer lighting conditions.
Having used chronographs extensively for several years now, it's clear that Oehler knows the business of chronographs inside and out. That becomes evident while reading their owner's manual, and should one ever need customer assistance to sort out any issues in the proper operation of their units. Their 35P provides the proof channel, which is invaluable IMO, if you really want to have some confidence that your chronograph data is accurate. Without two different chronographs run concurrently, or one Oehler 35P, I contend there is no way to know if your chrono data is valid.
Here's a link to a photo of my skyscreen setup:
http://www.longrangehunting.com/forums/f19/new-oehler-35p-new-skyscreen-rail-first-test-data-60778/
My skyscreen rail does require transport of a 6' 8" long skyscreen rail within a vehicle from the house to the shooting location.
I wouldn't give up on your CED until you talk with their Tech staff and see if you can't sort out the issue. From what I've read in other owner's Posts on this Forum, they seem to be a decent unit - once the owner's get the operational quirks worked out.