I read reviews on thm and they are mixed. I would not take a chance on them personally. I have a high preference for double gusset covers with newborns and EBF babies (any baby with runny poo.) I'd recommend thirsties covers. I have used the sized covers personally, but you could try their duo covers if you want something that lasts through more than one size or if you want snaps. (I'd pick velcro for a cover personally though with a young baby.)
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I also have like bummis super brites.
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Those are the only 2 I have personal experience with.
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Proraps - I haven't used the cover alone but I have used them sewn together with a prefold as an AIO. They work alright. Not my fave but funtional and cheap. Might be a good choice for a newborn at least.
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HTH