I do this and it works great. There was some talk about probs with the Group add fxn (works great for me on 1.1.8) and I thought there was a fix/patch for this.
I found the post:
http://www.gossamer-threads.com/...i?post=213396#213396
I found the post:
http://www.gossamer-threads.com/...i?post=213396#213396