I would agree with this. The A4 and B4 lounges are by far the better ones. A19 is a bit of a hole. As everyone knows (I hope) you will be given premium drinks coupons in the lounges. It varies between 1 and 2 per passenger (seemingly arbitrarily), and you may (or may not - again, on the whim of the AA staff) be able to get more. If you can't and you are in need of additional premium drinks then there seems to be nothing stopping you lounge hopping and picking up additional coupons in the other lounges!