While some State have onerous Probate requirements and a Revocable Trust (sometimes called a Living Trust) is useful in those States, Pennsylvania (which is one of several States that I practice law in) has a rather straightforward and quick Probate process.
While each person's case is different, and has to be evaluated independently for the most part I will recommend to client's that they not have a Revocable Trust. However, when a client has more than one place they live in or with property in several states, I may recommend a Revocable Trust.
As to the level of assets, that is a whole different situation. My advise to someone with $400,000 in assets might be the same as my advise with someone with $800,000 in assets but each case has to be evaluated independently as there may be other facts that would cause the need for a Trust, whether it was an Irrevocable Trust or a Revocable Trust.
Check out my website
www.elderlawusa.com for more information on the pros and cons of Revocable Trusts/Living Trusts.
General Disclaimer. This answer does not, nor is it intended to create an attorney-client relationship, but is offered solely for information purposes. Since the facts of each case are different, it is important to seek out qualified counsel with whom information can be shared and assessed under an attorney-client privilege so that competent and tailored advice can be provided.