@AngusMcleod, you are correct. It is harsh to completely categorize Inventables in one broad brush stroke, and most of it was born out of frustration. As a software developer who loves, appreciates, uses, and contributes to open source projects, it's frustrating when you get excited about a project/product and are willing to drop a significant amount of money to support it, to find that a basic feature (at least to me) isn't available.
I decided before I finalized my purchase and hit the submit button, I should go through a standard workflow to see how I liked the Easel software. I liked everything about it; from it being an online tool, to the helpful apps (the build a cube, I particularly liked), to the material, cutting heads, and cut depth options, to the preview mode; I really liked it. But when I looked for an export (as the last step in the workflow), I got frustrated when I found it unavailable. I knew it's not VCarve and the professional grade software, but "Why was it missing?", I thought. This software did so much, but didn't support an export option!?! You're right, I'll still buy the X-Carve, and I'm sure I'll love it (I have so many ideas of what to do with the platform), but the export feature, would have put the icing on the cake with no second thoughts.
As a side note, why doesn't Easel work in Linux or what didn't work? I ran it in Firefox on my Ubuntu 12.04 machine and it ran without a problem. Which distro are you using?