Count me as another vote for the RCBS bench tool. Mine's 25 or so years old too with no problems ever. Sometime's the last one or two primers in the tube dont end up in the cup right, but it's always when I'm hurrying.
I have found that when primers don’t seem to fit in the cup right, that the plunger has loosened a little. Every once in awhile I will pull the shroud down and tighten the plunger. I keep a large head decapping pin handy or a small Allen wrench which fits the hole in the plunger. Give it a little tweak and all is well.
