I have not ordered one yet, I will be moving in a few days and could not receive the parcel, nor take time to try it and make a review. I will wait to come back, but to be honest à US 90$ I'm not sure I can be the one that will make the test. I mean, I'll surely buy a unit if it works well, even if it is expensive, but I can't afford buying one at this price without being sure. At US 5$ it was not really a problem purchasing a prototype without being sure it would work, of course.

The price was half lower on Shapeways, right? Maybe you could reupload the updated version and order one unit to check everything works fine? In case you share the model file at some point (not sure this is your plan, but just in case), then I think I would prefer a later version with possible improvements from the results of the first tests and feedbacks. Again, if it was cheap (~30$ or possibly a little bit more), I wouldn't care buying early prototypes and I would actually be really happy to help on this project, but at 90$, I can't, and it wouldn't be wise.

Be careful with the last version you updated: the solidity checker still highlights a weak point at the bottom right, where the hole was. There is still an issue there apparently (solidity by itself is not really a problem I think, but they state that weak points may be impossible to print, so it is worth checking).

I noticed on the previous version that it was tiny, but it was possible to change the dimensions on the right tab (without altering the price, I was skeptical but, hey, "surprising but good news" you know...), so I thought I just messed up with the mouse wheel or something like that, and would have to put in the correct dimensions.