I've tried it with just one of my shorts. I like the subtitles configuration very much. It has lots of options and makes it easy to add them. But...

The subtitles editor is quite limited and a little cumbersome to use. For example, if it misses a word, I don't see a way to add it in the middle of a sentence. It should be easy to add it and make everything move (if there are, for example, 3 words per line) or, at least, simply add the word in the middle making the line one more word (it wouldn't be much of an issue, I guess). If you import a SRT file with the subtitles (the same one that you exported from the tool, after correcting it manually), instead of chopping it 3 by 3 words as default, it creates very large sentences that are so small that can't be hardly read. They definitely need to improve this. UPDATE: They've told me that I need to export the SRT setting it to "1 word per group" before exporting in order to be able to import it again. I'll try it.

Another lacking part is the B-Roll editor. The button to add a new slot is at the end, although you can add it at any position by editing the start and en times. You can edit the start and end time of each slot, but it won't necessarily match with the words attached to it.

If you add an image as a B-Roll, it doesn't have any way to add some dynamism to it. For example, if you add a wide image on a vertical video (a 16:9 image on a 9:16 video), you are only able to statically position it horizontally, but it would be much better to have the option to set the origin horizontal position, the end horizontal position and that it was automatically moved to create a simple panning effect (for example, from left to right): I needed to do it on another video editor). A fade transition (and other kinds of transtions) for the B-Roll would be nice too. UPDATE: they've told me they have this trabsition and effects on the pipeline, although I can't see them on the official roadmap. I hope they can add them soon.

Finally, a real bummer is the fact that, once you've generated a video, you can't edit it anymore. It is kept on your dashboard, but you can't touch it. If you find a simple error in a word or any other thing in the generated video: bad luck. You won't be able to edit it again in order to fix it. This is another thing they must definitely fix. UPDATE: They've told me that they will add a "Duplicate" button to allow editing an existing generated project. I'm not sure that's a good idea and I think they should simply allow to edit an existing project, counting each independent generation against the maximum allowed. That would be much clearer for the users.

Anyway, knowing this details, you can make a good use of it for short videos.

I think it's an useful tool for polishing YouTube shorts or TikTok vídeos and can help to save some time on the editing process. They need to improve the UX and add some features to make it even better.