I think I should add here, I have only trimmed 6 of my decks and for below reasons:
Arcus Arcanum and Robin Wood. Boy do the colours now bounce out and hit you between the eyes!
Mythic. This is my oldest and first ever deck and was just looking tired. I have not used it for a while, and always thought it was slightly too big. I have trimmed it down and it now has a fresh new lease of life.
Cosmic. I bought this from e-bay and it looked very tired and jaded. I think (perhaps wrongly) it had been in a smokers house as the smell was a little of that type, as well as having a slightly dull tone to the cards. These were trimmed down, and again they seem to bounce with a freshness and new zest for life.
Vargo Gothic. Already explained in previous thread. I have two sets, and it was my personal use deck that was trimmed.
Druidcraft. Same reasons as most others have stated.
Benefits: For certain decks, with no borders now being in the way when laid next to each other they tell a better story. For example if one of the nights is pointing towards or riding towards a character it shows as such. the other person's response also adds depth and meaning to this encroaching crusader. (just an example here - I could go on forever!!)
In short, when put right next to each other a new story appears which adds so much depth to the meaning. This could not have happened if there had been borders or barriers in the way.
I never, ever trim off the title of the card. Therefore, if any of the above decks had the title as part of the outer border, it would not even have a pair of scissors waved over them, let alone trimmed. My Druidcraft still has the grey stone border on one edge of the card where the title appears. It might sound strange, but looks fine to me.
The Robin Wood and the A.A. were the two though which really did leap out at me once they were trimmed. Very beautiful indeed.
So there you have it! My experiences and reasons for trimming.
Davina