http://roaringapps.com/app:469
It would appear Dragon's products work relatively well if you are using a modern MacBook Air or Pro based on its system requirements. Note, all Macs now ship with Lion, so issues with Snow Leopard only exist if you get a Mac older than July 20, 2011. Their website even says Lion works well with version 2.5.1 or later of Dragon Dictate. Since their system requirements say 10.6 or 10.7(.0), make sure they have tested with 10.7.1, 10.7.2, or 10.7.3, and if not, just get a Mac that has 10.7 prebundled. That way, in case something doesn't work in newer versions of 10.7, you aren't stuck with a can't downgrade issue. Macs newer than August 16, 2011 can't be downgraded to 10.7.0. Macs newer than October 12, 2011, can't be downgraded to 10.7.1. Macs newer than February 1, 2012, can't be downgraded to 10.7.2. Double check where you buy, what actual system is prebundled. Nuance sells their own pre-approved Microphone, which I recommend you get. The built-in Mac microphone has difficulty with some ambient sounds getting in. Good luck, and welcome to the Macintosh world!