I like its simplicity, the fact you don't see the likes on a picture, except yours, also the simple click to view large. Limiting factors for me are smartphone only (a PC version is scheduled but not yet available) and only one picture per post. Non English speakers told me they would like a cut and paste from a post to input in a translator.
All in all, I like it. For me it is what a photo app should be. I'll continue to use it.
Choosing Home gives you the posts made by those you follow, and only that. If they don't post, you don't get new stuff. To get other pictures, you must either search using one of the tags or using the @name. It works fine here.