Yes, not all skins are created equal. I use the fabulous
"Day" and "Night" skins by Robert A. Fowler. They have all the features, including the arrow symbols to scroll through your annotations. The "Day" skin provides excellent contrast for daytime reading and the "Night" skin allows nighttime reading with a minimum of glare (it's easy on the eyes). And I can easily select between these two skins by taping on the time clock at the top right of the skin (several of the skins have this feature).
Also, I have no trouble deleting any type of annotation (bookmark, hightlighting, strikeout). Just a single tap on the annotation brings up the pop-up menu with the second option on the menu being "delete". I've tested this on the latest version and on the last free version without any problems.
Finally,
version 0.9i is now out.