I read it a few monthes ago and loved it.Even if at time one get lost in intricate cross references,the tone and the plot kept putting one back on track.
I can easely imagine a re-read better for the terrain being a bit prepared then,having ones marks to focus more one quality of the writting instead of not getting astray.
I also liked the deep ironie of Eco about his own work.The interest of studies and research but the frailty of interpretation.The fact that all those highly instructed peoples run after chimeric clues.The adictiveness of the search in itself. The main difference betwin Eco and Brown is there,and the fact that Brown style is much closer to Dick Francis.