I have the original 16x16" version, for me it's not too heavy, I find it easy to move around. Apparently they have a new version that is half the weight of my original one, so if the weight would be an issue for you, that might be another reason to give this a try. I could see bringing this to a retreat.
I keep it on the little rack that is part of the legs of my ironing board. Whenever I'm pressing and *not ironing* I use it. That's what this thing really helps me with. As you probably already know, when you're piecing, you have to get those seams opened up and the allowances going in one way or the other without distortion. Moving the iron is necessary, but I'm only moving the seam allowances, and the pressing surface holds the rest of the fabric.
For final pressing the Best Press usually isn't necessary.
Two thumbs up from me on this one!