I've had many many clients come to me to fix their trademark application after trying to do it through Legal Zoom. I really don't recommend trying to obtain a Federal Trademark Registration through Legal Zoom for a variety of reasons but I will highlight a few:
1. Legal Zoom doesn't do a common law trademark search for you. Without this search you could miss a prior user of your proposed trademark and be infringing another mark without your knowledge.
2. Most trademark applications will require you to interact with an examining trademark attorney before your mark is approved. Legal Zoom does not handle this for you and without a seasoned trademark attorney to help you, you may very well give up certain rights to your trademark that you will not realized until it is too late.
3. Legal Zoom's price does not include the Federal Filing fee. If your application is denied registration you will not be able to get a refund of your filing fee. If you look around you should be able to find a trademark attorney who will be able to give you a much greater chance of success for marginally more money.