First, we have updated the brief and posted some general feedback, so we'd appreciate if you can get familiar with the changes and see if you can update accordingly. Check also the logos we've uploaded for inspiration. These are great logos that we love, so it's a very good representation of the styles we're looking for. in that selection, there's basically a very simple route and a more sophisticated and sleek route (with 3D, shades, gradients, etc.) we're open to both routes.
we like your design essentially for the choice of marks you've used. We think there's good potential here and it's worth pushing further by maybe trying to establish a link between the mark and what we do and add some sophistication maybe.
We think the text is maybe too big and we'd like it to be more discreet, as for the font, we think you could maybe explore others, more original and "slimmer" (i.e. we like "ISE" in entry #1 more than on the other, but we like the mark better in the others).