Examples:
1. I'll type in a word such as "wedding". Results come back that there are no matches for "wedding" but it suggests alternatives such as "marriage" or "soup kitchen". "Soup kitchen"?
2. I'll type in "wedding" and it will actually come back with suggestions this time showing the average cost per click as £1.36 for the UK alone for top place. I then ask it to tell me what it would be for the whole world ... avg cost per click turns to £0.56 for top spot. It costs over a pound per click to be No.1 in the UK but half that to be No.1 for the whole world?
3. I'll type in "wedding", click the synonyms box and the results returned are "wedding" and "weddings" and that's it. I'll search again and it will say no matches. I'll search again and it will say no matches. I'll search again and it will return "wedding" and "weddings". I'll search again and a huge list of keywords/phrases with the word "wedding" in them finally appears.
Last time I posted I provided screen shots of the results I was seeing and there was a distinct lack of help from the Google Adwords employees that post on these boards (even less than what you get from their helpdesk!).
I've also found that the target geographic area has a major impact - apage targeted at, say, USA, will typically generate a lot more keyword suggestions than if the same page were to be targeted at, say, the Falkland Islands.
Appart from this, I have found one or two topics where the tool offers little or nothing, but most times it works only too well. (I kept using up my keyword allocation)