On RPGNet, Kafka has given 13th Age an excellent 5 for Style and meaty 4 for substance. Describing the art as “truly phenomenal” and the writing as “superb”, Kafka states that “Purple prose is in abundance and makes reading a delight, as opposed to realms of rules and tables”, but also points out that:
“The casualness is not to be mistaken for a languid tone but rather a playful and humorous conversation that one would have with a friend.”
Kafka concludes by saying “If you are d20/4e player, you should certainly pick up 13th Age, and even if you are a causal FRPG player/game master like myself – this is a rich tome containing lots of useful information.”
You can read the full review here.