Trimming brass is the bane of my existence. I only have 223, but I have A LOT of it. I shoot upwards of 1000 rounds of it a month, and if I don't process it promptly, I have a monster pile of brass.
Currently I have the Lyman universal trimmer, which while it does an OK job, isn't my favorite. I've noticed that the OAL length varies after trimming X number of cases, so I have to keep an eye on that throughout the trimming process.
I think I'm going to upgrade to an RCBS power trimmer (or ideally a Giraud). My poor arm gets sore as can be trimming all that brass.