I've been using my Lee Auto Bench Prime for about 3 years and have primes several thousand cases with it in that time. I went to a bench tool because I found I wasn't getting consistent results with a hand tool.To be completely honest, I'm on the third body and second priming mechanism...and I still think it is a great priming tool
Being an early adopter, I found that the priming mechanism was prone to jam. Not a problem, Lee also discovered the issue and sent me a set of new mechanisms.
While trying to clear the jam, I ripped off the collar which retains the shell holders. Lee stepped right up and sent me a new body...that';s when I found that the Bench Prime and Auto Prime use the same mechanism in different bodies. The other body also died when the collar gave way...this time when a buddy didn't understand, "Feel the primer fully seat" and took that to mean, "Smash it like Mongo"
Other than those hiccups, the Bench Prime has been flawless. I really like not having to pole primers into tube. I like seeing how many primers are left. I like that I can prime .38Spl and .45ACP cases with just two fingers pressure. You do have to prime with full strokes and it also helps if you feel the primer lineup with the pocket before pushing it in. You should release the handle fully before removing the primed case...keeps it from turning sideways.
I have mine mounted on an Inline Fabrication Quick Change plate and it shares space on my mount with a Lee Classic Cast single stage, ACP, and APP. Using both hands, I can insert a case, prime, remove the primed case, and insert a fresh case in about 3sec...so a tray of primers in 5mins...this includes insuring that the primer has been inserted below flush . If you load up 5 trays to start, you can get through them in about 45mins