I've read the first two so far and loved both of them and will be reading the next in the next month or so.
I'm generally not a great fan of first person POV (though I do seem to have been reading more of them just recently) and, whilst it does have its limitations, such as being pinned to the actions of one person and any other actions only being narrated through dialogue, it also puts the reader very firmly into the middle of that one person's actions. This is particularly noticeable in battle scenes where you really do feel like you are there.