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spark: it can import a lot of files at the same time keeping them in a different color, show textures and it lets you edit without changing enything until you save. But it can only export one file at the same time or rebuild. It supports draging import/export.
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alci's img editor: it can import a huge ammount of files really fast keeping them in different colorm It can also export ALL files at the same time more or less fast and it can rebuild very well. It cannot show textures and after you imported, when you click save it takes a little time saving.
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G-img: it's the most complete one but you cannot see the whole texture if it is too big as you cannot scroll with mouse wheel and it doesn't have any saving feature. it does direct editing. It supports draging import/export.
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img manager: this is the best tool by far. But you bannot directly view textures and it won't remember how you left the window or where did you do importing last time. It supports draging import/export.
So now go delette img tool 2.0 and take one of these or even all. I use al of them.