I'd pay for this plugin - it is that good. I am using it with WordPress 3.8.1 and there seems to be no major issues so far - to view a sample visit http://www.sevenchild.com
The main issue I have found is that any hyperlinks you set for images do not work when you tap them on an iPhone browser. Not sure about other phones or OS. The links work fine in Firefox or Chrome for PC when you click on an image.
Also, the slide effect (when chosen) 'slides' on PC but has an 'inflation' sliding effect on iPhone. Not a problem but inconsistent. I have experienced no re-sizing issues on mobile.
The content management interface is well set out and easy to use. Dragging an image to the right to include it in a side show is tedious though because you have to drag it to the top or at least to the lowest image chosen already (a pain when you have a screen full of images down the left side).
Overall though - I love it.