I've been using a Dillon 550B about a year and a half and had I known how easy it was to change calibers I'd have bought it years ago. I love it. Buy it and you won't look back. I load .38, 9MM and 45ACP on it. Load 500 or so of one cal. then switch etc. Just watch the primer and the powder and you can load a lot of rounds in a short period of time. You can even load rifle ammo on it if desired.
I considered a Lee but my experience with Lee products isn't all that good and apparently the primer feed on the Lee gives problems.
My 2 cents.