Fillable PDF improvements?

I am still on Mac OS X 10.6 Snow Leopard, and several times over the years I've filled in fillable PDFs with Preview only to be told that the person on the other end couldn't see everything I filled in (that certain sections showed up as blank and they thought I didn't fill them in). When I open up the same updated/filled PDF file, I see my work. Has this improved in Lion or will this be fixed in Mountain Loin? Has anyone else experienced this? I don't want to buy a separate application, as I love Preview. Thanks for any feedback!