If you're interested in a bench top primer, the LEE Bench primer is a bit better, it still uses the same triangular shaped tray, but it works pretty good. I mounted mine to a piece of scrap wood and use clamps to hold it in place on the bench. You do have to fiddle with it at times, but mine does the job the majority of the time. If you keep an eye on the primer feed and fix the rogue primer before seating it, there is less frustration with it.
If you want a hand held one, the RCBS universal is almost bullet proof IMO