I've been in twice, the first time I was a bit "whelmed" on a Saturday morning. The cashier was standoffish and but the smoothie (anti-oxidant berry?) was pretty good.
The second time was great! It was a weekday late lunch-time snack, and I got the Cookies and Cream smoothie. Much friendlier service - she actually gave me their stamp card, and I like this smoothie better!
I've seen a lot of comparisons to IQ, and I must say I find the staff at Evolution much friendlier!