Determining good writer software

People will often praise writer software. A lot of the software out there is really great. However, there's a good portion of software that is complete junk. I think the best way to determine the difference, beyond getting other people's feedback,is it to only purchase at when you need it.    If you do this, then you will use the software right away. That will help you determine how useful the software is. If you find that it's useful, then you can put it into your daily practice. If not, then you can get a refund on your software. I think this is the best way, to determine if the writing software is junk. You can also check out websites and support forums to find any information that you need to make the software useful. Again, the key is to need the software right before you use it.