I once downloaded the free version from Dreamspark (some MS dealer that gives out free stuff to students) and used the web software for a while. what i needed up with were corrupted pages all the time that for some reason i needed to rename to make them work. i now use dreamweaver and so problems at all. i rather pay $300 for a software than to use that free software (free to students at the time).
I didn't use too much of their graphics software etc., but my impression is it creates too many MS-proprietary files that are not universally accepted.
it seems MS realized not even giving them out free makes people use their products. i really like MS products (windows, Office etc.) but in some areas they are not good at. And professionals spend a lot of time in training and learning to use the tools. A software being cheaper doesn't really help a lot if it isn't up to the task.