The products themselves are often very interesting. The next step in consideration is whether they are fit for purpose, though. Google have made a reputation for themselves for abandoning their products/services, but at the same time anyone pragmatic will realise that they won't abandon everything they launch. So if you're interested in taking up a Google product, you will then consider whether it's one of the products/services that they are likely to continue supporting or not.

I think it's highly predictable. Where in their org does it fit, how much have they invested in it, how big is the opportunity, etc.