I've already recommended this to my stamping friends on Facebook. It is a great product, excellent quality. I love being able to flip the lid around to stamp with clear or red rubber stamps. The smooth magnetic surface is easy to clean up.
If I tried to find a negative, it would be if you place your stamp very close to the side where the "leg" of the lid comes down, you may not get a solid inked impression. I just try not to place my stamps close to that edge. Hope this makes sense.
I also own the 'other' stamping platform that's been around a while, and I really love this one more due to the lid flip option and the larger size and the fact that I don't have to keep up with gridded paper or a piece of foam. Just grab it and start stamping.