From time to time I need spices the grocery store doesn't carry. In fact, I recently bought some basics from Penzeys. I do enjoy their spices but they are not my favorite place a close second. I find they tend to be a little more expensive than their competition, which for some spices is ok and others you know it's just not worth it. They do have some unique offerings and certain ones are better than the competition.
I find Penzey's does really well on the exotic single spices, but I'm not their biggest fan on the blends. For example, their air-dried shallots are one of my favorites along with their tarragon.
If you sign up for their newsletter, they often run deals or freebies for special occasions, so that's always a plus. I find getting to the Penzey's store puts my out of my way, so sometimes I end up missing some of the better deals unfortunately.