I have two Sonorans, adult males both under 4'.

As the other posters said, they can be quite hissy but mine both calm down once picked up...

They do seem more exciteable than commom boas, mine will snap at fast hand movements far more often than my other boas...so lots of slow movement for them...

They come in a hypo variety as well...the colors are different than a common hypo boa...this little guy looks like he is perpetually in shed...lots of soft pink and grey...