I very much enjoy reading books set in classical times and I have read some cracking ones (Conn Iggulden's Emperor series for instance) and some very forgettable ones (sorry, I have forgotten the titles of those!)
This series is very much in the excellent category. The story is compelling, and I put off various things I was supposed to be doing until I finished it. The action is well written, and the characterisations are excellent. This is one of those books that sucks you in and makes you really feel you know these characters. You love, hate and get angry with these people.
In terms of pacing, the only thing that interrupts the flow of the story a little is all the Latin asides, or quotations from classical works. On the plus side, you come away from this book feeling educated! (Well maybe that is not a good thing, depending on your views on education). None of this feels pretentious though - it is more that the author clearly has expertise in these fields and writes as he wants his story written.
But that won't spoil the story. Thoroughly recommended to anyone who likes classical or historical fiction.