I have not had any issues with my Lyman AA8 and I've loaded 100 rounds of 6.8 SPC on it so far. I have not have one single spent primer fall to the floor. I had a couple that didn't exit the inside of the ram, but I raised and lowered the ram an extra time and they both fell out into the cup. I also have not had any issues with the on-press priming system. It's very good in my opinion, WAY better than the Lee Safety Prime system I was using on my Classic Turret. I did notice that inside one of the primer pickup tubes, it had some debris that I had to poke out with a straightened metal hanger, but after I got that poked it, the tubes pick up and dispense primers without any issue.
And I never understood the complaints from some about the primer tube and priming system being directly in front of the ram. When reloading, I stand directly in front of the press so that my right hand is close to the press handle and I insert cases into the shell holder with my left hand. It's MUCH easier for me to actually index the shell holder at a 45 degree angle (somewhere between 7 and 8 o'clock) instead of being directly up and down. I can grab a case with my left hand and slide it in the shell holder at a 45 degree angle and I don't have to step to the side to get at the shell holder if it was directly up and down. The primer tube doesn't get in my way at all being in the front. And if you think a small blast shield tube blocks your vision of the case, you're a prima dona! Turn your head a slight bit and you can see around the primer tube! It's people who make complaints like that who I believe are just looking for a reason to justify the press they already have and try to find some kind, any kind of fault with another press. Redding owners and fan boys are really gonna get butt-hurt about this press. I've used a Redding before and this Lyman works almost exactly the same way, is just as well made, and costs a LOT less, but you'll have a hard time getting any Redding fans to admit that. Personally, I'm not brand loyal to anything. If it works, it works! If it's works at a cheaper price, then that's even better! I own Dillon, Lee, and now Lyman presses. They all have their pros and cons.
Congrats on your purchase! Get it bolted down to your bench tightly, and oil ALL of the linkage joints, the ram, and lightly coat the primer feed push lever and I'm sure your press will be as good as mine. I already bought another turret head for mine. Let us know how it works out for you!