Oh do ask questions, please
Well, this is the only deck of mine I trimmed so far. Since the backs aren't reversible anyway the assymentry of the picture after the cut doesn't bother me at all. (HA, if I were to be bothered with the backs at all I'd be mostly irritated by their bland, washed out color). If you feel you're harming the cards in a way obviously don't do it. For me they're just pictures on paper for me to make use of, and I find I make better use of them without the borders and signs - just the picutre, no distractions. But then again, I'm the intuitive type. I don't go "hmm ace of swords.. well, aces mean beginnings and swords mean this and that etc". I go "hmm why is this guy pulling at the sword instead of running away from the fire? Or is he pushing? There's no blood spilled... yet" etc
Another thing, the borders, for me, were too hmm "technical"? Sort of clashed with the watercolor illustrations, as if I was looking at the pictures on a monitor. Like this they're almost the size of standard playing cards (a bit longer), so that's another plus from my point of view. I was hoping to link some pictures to the trimmed deck, but this will have to wait as my scanner is playing up :/ But in the meanwhile you can have a look at my take on the cards if you're interested - here are some links to threads I started in the exchange forum:
http://tarotforum.net/showthread.php?t=80619
http://tarotforum.net/showthread.php?t=85380
http://tarotforum.net/showthread.php?t=86656