I've seen that show several times now - it is better in HD.
The photography is excellent, with some unusual shots (e.g, from below a glass table), imaginative lighting, and great close-ups. The sound is neat too, it isn't often one can hear a tongue-flick!
I found the narration and some of the soundtrack a bit, well...perhaps "over-dramatic" would be appropriate. Not unexpected, given the show wants to appeal to a wider audience then just snake/herp fans.
There are a few factual errors, and places where the narration doesn't quite fit the images. But far less than one becomes accustomed to from the average "Nature-Show-Doing-Snakes" drivel.
Overall, I give it an A-minus, certainly worth watching.
John D

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I am so not lesdysxic!
0.1 Creamsicle Cornsake
1.0 Bairds Ratsnake
0.1 Desert Kingsnake
1.1 Eastern Kingsnakes