It works for me with some hacks.... Images don't always get properly resized. I have various avatars which don't have a 150 version (while the image is big enough) or have the full version listed as the 150 version.
Also the images are not uploaded to the media gallery so you can't hook into them with actions such as regenerate thumbnails or adding a watermark.
So that's why I prefer to look for a better one.... I might code my own with the use of ACF.