Pros: basic bear is economical, fun for ALL ages
Cons: it can become addicting!
In fact, I had my 25th birthday party there! The party was loads of fun - they treated my friends and me just fine even though we're a bit older than their target age group. ;-)
Build a Bear workshop has many different price options - it can cost you as little as $10 for a basic bear to $50 and beyond depending on what kinds of accessories you buy. They have many different types of animals to choose from - not just bears. In fact, they have a very cute Shrek doll right now! I'm very tempted to go and get it now. :-)
My partner have a collection of various build a bears; each fits our personality in different ways. That's the cool thing, you can make a bear that's for YOU and YOU alone. Build a Bear also has a great selection of sounds you can put into your bear/animal - from a growl to a song, from a meow to ruff.
They also have a great rewards program. I'm always getting random coupons in the mail from joining their "Stuff for stuff" club. And these are not negligible coupons - I'm talking $10 at a time.
In short, Build a Bear = MUCH FUN no matter how old you are. It'll bring out the child in you.
Just beware, Build a bear can become addicting.