Needs some improvement but not bad

Neat plugin and of course can’t complain too much
when it’s free.

However, it has some issues, some that can be easily solved.

It’s not responsive (at least on the latest 4.6 WordPress)

I tried some others (free and paid) and it is a bit choppy,
not too smooth when you drag the slider (whether you do it slowly or not),
compared to some others.

The slider is not aligned correctly, making it not go all the way to the left
but go too far to the right (passed my image).

It also displays a text on top of your ‘before’ image, namely: “modified”.
(I commented it out using some Custom CSS plugin and the following code:

.cd-image-label { visibility: hidden !important; }

)

Another thing that’s a bit frustrating is easily copying the shortcode..
It’s greyed out text that’s not selectable (it doesn’t highlight the text,
doesn’t show a cursor and just clicking on it and Ctrl-C doesn’t work either).

I don’t know if you can solve the smoothness easily but
at least I’d recommend the developer removes the ‘modified’ text
and makes the shortcode selectable.

If there’s any plan to seriously work on it, I’d be happy to pay
for a premium version as well, where you can change the color
and overall appearance of the slider, have an automatic option
and more.