Hmm, interesting conclusion to the series.
(assuming it is the conclusion). I love the books about the arena, and while I certainly hope the author produces more, it looks like this one ties up as many loose ends as we're likely to get, and so I don't hold out too much hopefor additional titles in the series. I do however, wholeheartedly recommend the series, especially the first book, since it plunges readers into such an amazing world. I'd guess that nearly any scifi fan will enjoy the first book, and may or may not enjoy further volumes in the series, but if you're like me, and like to see storylines completed, then reading all four books is a must, but if you just want an excellent tale, and something to fire your imagination, and don't care about completing the series, then the first book is good enough, but by not reading the rest, you truly are cutting off your access to so much more in the arena universe.
It's a very exciting journey, and one I'd highly recommend.