I have only been to Jessica Knits once and I will be there again, but not for a while. First of all, I need to make sure I have plenty of money to spend on the high-end yarn. Her inventory of higher-end yarn is unparalleled, there is no doubt about that. Her store is very well organized and her library is incredible.
Here's why I am giving Jessica Knits 3 stars as opposed to 4. The owner and her staff person seemed very uninterested in helping me or my friend. She knew it was our first time in and didn't make it a point to make us feel welcome. I think it is her disposition by nature and she is oblivious. I also didn't get a real "youthful" vibe from the shop. I am in my early-thirties and I kind of felt like "downtown Phoenix urban riff-raff". I wouldn't say she was unhelpful because she did look up a pattern for me in ravelry and suggested yarn for it.
She carries yarn brands that you would be hard pressed to find in other stores and for that I will be back with my wallet, but I won't be staying to hang out... that's for sure.