Running alone vs running with a group

I usually train on my own and until recently, hadn't thought of doing it any differently. In fact, I thought running with someone else could really annoy me. I suppose I've thought negatively about running with a group because of the ocassional school cross country training I attended(boring!). However, I did a Nike training session for Run for the Kids and LOVED it (pity I could only get to one). Now, I'm joining Richmond Harriers and I'm training with Andrew when I can. Although I probably won't get to train much with Richmond during the winter when it gets dark so early!!! Now I love running with other people (only if they run at my pace though!).