If it helps, here's my review of an Agile Baritone:
http://www.youtube.com/watch?v=D5q0g1DP2ZUNegative points of this particular guitar aside, I actually feel that it was a very comfortable transition from the 24.75 and 25.5 I am used to, up to the 27" scale. In fact, I was so comfortable with it, I could hardly feel the difference between 25.5 and 27. A little more of a stretch at the bottom end, but not by a lot.
I was so comfy with this transition that, actually, I rather wish I had bitten the bullet and gone for a full 28.75 scale Guitar, but not having anything to try out beforehand I went for the safer 27 option.
Sound-wise, you can really hear the difference on something in your chosen tuning on a longer scale neck. It's clearer, tighter and more responsive. That extra couple of inches helps a lot when playing lower tuned stuff. Harder to bend notes, yes, but I hardly care about that at all, a little extra effort is a small price to pay for a much better sounding guitar!
If you really want to hear the difference and get the best possible results, I would go for no less than 27, I would probably even recommend the 28" scale length and upwards if you can find something you like in that range. The 26.5 Schecters I tried were very nice sounding, but they did just sound like I was trying out a 25.5 guitar and didn't have the added tension I really needed for my style of play. The 27" is starting on the right path, but to get the full effect, as I say, I wish I had gone longer again.