I come here out of convenience, since Jamba Juice is a bit of a drive.
I find their smoothies to just be "OK". They do the job, but its definitely not top quality in my opinion. Their smoothies are so "ice-y" where every sip I take, I feel like I'm chewing on ice bits. There are people who like that, though, but not me. I also find some of the smoothies are watered down, and not very flavorful.
I prefer Jamba Juice, where the smoothies are smooth, thick, creamy and delicious.