As far as Retics being advanced, I would say so mainly for like what Drew said with the feeding response, fast acting movements, and of course overall size. As for musking, I doubt you'll have too much to worry about, the only Retics I've ever been musked on by were Super Dwarves.

There are a lot of things to consider with owning large snakes, for one, time... Takes a lot longer to clean an 8' cage vs a 41 qt ball tub... Space can be an issue for a lot of people as well...

I don't own burms anymore, but I overally found out I liked Retics more... I don't know what it was about burms, they just hissed at me too much.

Overall, I found Retics to be rewarding to own though... They are a lot of fun...