You wrote "It's nice but you don't(shouldn't) really notice it if it's not there."
I like it. Simple but you are conveying the right message with few words and nothing complicated (geeky).
PR is important only if you want to sell ads spaces on your website/blog.
I have about 25+ sites with low PR (less than 4) but my full-time
ebiz is doing fine because I have been getting very focused visitors. As such I don't need thousands of hits to
get a good conversion rate.