I use this software a fair amount at work due to having limited admin support.
I find that once you are used to the program you can really rattle along. It is well worth taking your time to train it properly, it has a very user friendly interface and a comprehensive instruction book. As you have probably deduced, I am quite a fan and would heartily recommend it!
If you are using any version of Office XP check out the Dragon Website as you may need to tweak the Office speech recognition settings.